gambit-scheme: don't try to build with GCC 4.2 or 4.3
gambit-scheme: don't try to build with GCC 4.2 or 4.3

refs mistydemeo/tigerbrew#389.

getgauge/homebrew,elyscape/homebrew,polishgeeks/homebrew,LinusU/homebrew,dplarson/homebrew,getgauge/homebrew,quantumsteve/homebrew,feelpp/homebrew,bukzor/linuxbrew,elyscape/homebrew,vigo/homebrew,redpen-cc/homebrew,osimola/homebrew,quantumsteve/homebrew,princeofdarkness76/homebrew,gicmo/homebrew,dutchcoders/homebrew,dunn/homebrew,joshfriend/homebrew,MoSal/homebrew,mkrapp/homebrew,marcwebbie/homebrew,cprecioso/homebrew,benjaminfrank/homebrew,adamliter/homebrew,treyharris/homebrew,retrography/homebrew,influxdb/homebrew,sakra/homebrew,bigbes/homebrew,tschoonj/homebrew,Homebrew/homebrew,gicmo/homebrew,skinny-framework/homebrew,kodabb/homebrew,princeofdarkness76/homebrew,BrewTestBot/homebrew,vigo/homebrew,iandennismiller/homebrew,cosmo0920/homebrew,scpeters/homebrew,drbenmorgan/linuxbrew,LinusU/homebrew,saketkc/linuxbrew,mobileoverlord/homebrew-1,danieroux/homebrew,georgschoelly/homebrew,muellermartin/homebrew,elgertam/homebrew,bukzor/linuxbrew,thinker0/homebrew,dutchcoders/homebrew,marcwebbie/homebrew,danieroux/homebrew,OJFord/homebrew,cscetbon/homebrew,recruit-tech/homebrew,jsjohnst/homebrew,dalanmiller/homebrew,dongcarl/homebrew,dongcarl/homebrew,tschoonj/homebrew,royhodgman/homebrew,reelsense/homebrew,ear/homebrew,kodabb/homebrew,reelsense/linuxbrew,SuperNEMO-DBD/cadfaelbrew,hanxue/homebrew,menivaitsi/homebrew,reelsense/linuxbrew,utzig/homebrew,ear/homebrew,kodabb/homebrew,mactkg/homebrew,benjaminfrank/homebrew,miketheman/homebrew,treyharris/homebrew,gnubila-france/linuxbrew,AlexejK/homebrew,josa42/homebrew,bukzor/linuxbrew,dgageot/homebrew,kenips/homebrew,miketheman/homebrew,tutumcloud/homebrew,Red54/homebrew,kenips/homebrew,chadcatlett/homebrew,scorphus/homebrew,Chilledheart/homebrew,Linuxbrew/linuxbrew,iostat/homebrew2,royhodgman/homebrew,apjanke/homebrew,recruit-tech/homebrew,vigo/homebrew,AlexejK/homebrew,alebcay/homebrew,kevinastone/homebrew,ento/homebrew,ybott/homebrew,totalvoidness/homebrew,liamstask/homebrew,LinusU/homebrew,ento/homebrew,hakamadare/homebrew,iostat/homebrew2,ryanfb/homebrew,ablyler/homebrew,polishgeeks/homebrew,iandennismiller/homebrew,youtux/homebrew,benjaminfrank/homebrew,bigbes/homebrew,teslamint/homebrew,kevinastone/homebrew,ablyler/homebrew,hanxue/homebrew,youtux/homebrew,thinker0/homebrew,Homebrew/homebrew,MoSal/homebrew,booi/homebrew,iandennismiller/homebrew,yazuuchi/homebrew,jsjohnst/homebrew,adamliter/homebrew,skatsuta/homebrew,emcrisostomo/homebrew,frodeaa/homebrew,kenips/homebrew,jamer/homebrew,BrewTestBot/homebrew,frodeaa/homebrew,mactkg/homebrew,sferik/homebrew,gnubila-france/linuxbrew,OJFord/homebrew,cscetbon/homebrew,Asuranceturix/homebrew,jamer/homebrew,zchee/homebrew,scpeters/homebrew,ilovezfs/homebrew,johanhammar/homebrew,decors/homebrew,skatsuta/homebrew,benjaminfrank/homebrew,tutumcloud/homebrew,utzig/homebrew,hakamadare/homebrew,teslamint/homebrew,hongkongkiwi/homebrew,zchee/homebrew,quantumsteve/homebrew,Homebrew/linuxbrew,sferik/homebrew,ento/homebrew,theeternalsw0rd/homebrew,iostat/homebrew2,pcottle/homebrew,filcab/homebrew,influxdb/homebrew,dunn/homebrew,drbenmorgan/linuxbrew,johanhammar/homebrew,esamson/homebrew,ebouaziz/linuxbrew,cprecioso/homebrew,ryanfb/homebrew,bigbes/homebrew,scpeters/homebrew,tschoonj/homebrew,adamliter/homebrew,cscetbon/homebrew,optikfluffel/homebrew,hongkongkiwi/homebrew,getgauge/homebrew,LinusU/homebrew,osimola/homebrew,saketkc/linuxbrew,Red54/homebrew,josa42/homebrew,kodabb/homebrew,SteveClement/homebrew,galaxy001/homebrew,redpen-cc/homebrew,dplarson/homebrew,eighthave/homebrew,dongcarl/homebrew,slyphon/homebrew,reelsense/linuxbrew,utzig/homebrew,sjackman/linuxbrew,hanxue/homebrew,hakamadare/homebrew,Chilledheart/homebrew,brunchboy/homebrew,michaKFromParis/homebrew-sparks,nandub/homebrew,jsjohnst/homebrew,slyphon/homebrew,deorth/homebrew,gicmo/homebrew,influxdata/homebrew,MoSal/homebrew,georgschoelly/homebrew,alebcay/homebrew,jarrettmeyer/homebrew,pcottle/homebrew,osimola/homebrew,recruit-tech/homebrew,knpwrs/homebrew,Red54/homebrew,esamson/homebrew,saketkc/linuxbrew,afh/homebrew,yazuuchi/homebrew,frodeaa/homebrew,theeternalsw0rd/homebrew,dickeyxxx/homebrew,totalvoidness/homebrew,SuperNEMO-DBD/cadfaelbrew,miketheman/homebrew,recruit-tech/homebrew,3van/homebrew,Linuxbrew/linuxbrew,polishgeeks/homebrew,galaxy001/homebrew,sometimesfood/homebrew,mmizutani/homebrew,DoomHammer/linuxbrew,lrascao/homebrew,reelsense/linuxbrew,Chilledheart/homebrew,ExtremeMan/homebrew,haihappen/homebrew,polishgeeks/homebrew,lrascao/homebrew,michaKFromParis/homebrew-sparks,ybott/homebrew,elyscape/homebrew,retrography/homebrew,youtux/homebrew,knpwrs/homebrew,getgauge/homebrew,dunn/homebrew,sjackman/linuxbrew,mobileoverlord/homebrew-1,hanxue/homebrew,ExtremeMan/homebrew,drewwells/homebrew,scorphus/homebrew,menivaitsi/homebrew,decors/homebrew,dplarson/homebrew,osimola/homebrew,ryanfb/homebrew,johanhammar/homebrew,elgertam/homebrew,scpeters/homebrew,yazuuchi/homebrew,influxdata/homebrew,sferik/homebrew,ybott/homebrew,drewwells/homebrew,Chilledheart/homebrew,OJFord/homebrew,ralic/homebrew,bigbes/homebrew,ExtremeMan/homebrew,dericed/homebrew,mobileoverlord/homebrew-1,mactkg/homebrew,thinker0/homebrew,3van/homebrew,retrography/homebrew,TaylorMonacelli/homebrew,iostat/homebrew2,danieroux/homebrew,alebcay/homebrew,sometimesfood/homebrew,mactkg/homebrew,cosmo0920/homebrew,base10/homebrew,filcab/homebrew,treyharris/homebrew,totalvoidness/homebrew,ybott/homebrew,ExtremeMan/homebrew,reelsense/homebrew,drewwells/homebrew,MoSal/homebrew,dgageot/homebrew,miketheman/homebrew,3van/homebrew,Homebrew/homebrew,Angeldude/linuxbrew,hongkongkiwi/homebrew,muellermartin/homebrew,hakamadare/homebrew,knpwrs/homebrew,Asuranceturix/homebrew,youtux/homebrew,yumitsu/homebrew,TaylorMonacelli/homebrew,ryanfb/homebrew,dutchcoders/homebrew,princeofdarkness76/homebrew,mmizutani/homebrew,deorth/homebrew,liamstask/homebrew,pcottle/homebrew,michaKFromParis/homebrew-sparks,Homebrew/linuxbrew,deorth/homebrew,ear/homebrew,teslamint/homebrew,BrewTestBot/homebrew,keith/homebrew,MartinDelille/homebrew,Red54/homebrew,brunchboy/homebrew,mmizutani/homebrew,drewwells/homebrew,influxdata/homebrew,base10/homebrew,danieroux/homebrew,cosmo0920/homebrew,sometimesfood/homebrew,royhodgman/homebrew,MartinDelille/homebrew,dgageot/homebrew,jarrettmeyer/homebrew,dgageot/homebrew,ilovezfs/homebrew,optikfluffel/homebrew,elyscape/homebrew,princeofdarkness76/homebrew,Linuxbrew/linuxbrew,ento/homebrew,menivaitsi/homebrew,dickeyxxx/homebrew,reelsense/homebrew,marcwebbie/homebrew,Homebrew/linuxbrew,ebouaziz/linuxbrew,royhodgman/homebrew,hongkongkiwi/homebrew,ebouaziz/linuxbrew,cprecioso/homebrew,mmizutani/homebrew,eighthave/homebrew,jsjohnst/homebrew,bukzor/linuxbrew,Asuranceturix/homebrew,joshfriend/homebrew,sakra/homebrew,OJFord/homebrew,knpwrs/homebrew,utzig/homebrew,frodeaa/homebrew,BrewTestBot/homebrew,gawbul/homebrew,skatsuta/homebrew,DoomHammer/linuxbrew,redpen-cc/homebrew,keith/homebrew,TaylorMonacelli/homebrew,galaxy001/homebrew,chadcatlett/homebrew,Angeldude/linuxbrew,ebouaziz/linuxbrew,totalvoidness/homebrew,tschoonj/homebrew,nandub/homebrew,pcottle/homebrew,influxdb/homebrew,jarrettmeyer/homebrew,emcrisostomo/homebrew,sakra/homebrew,yazuuchi/homebrew,base10/homebrew,ralic/homebrew,afh/homebrew,iandennismiller/homebrew,emcrisostomo/homebrew,gnubila-france/linuxbrew,muellermartin/homebrew,ablyler/homebrew,ear/homebrew,galaxy001/homebrew,teslamint/homebrew,drbenmorgan/linuxbrew,feelpp/homebrew,sakra/homebrew,kenips/homebrew,DoomHammer/linuxbrew,cosmo0920/homebrew,jamer/homebrew,keith/homebrew,Homebrew/homebrew,slyphon/homebrew,liamstask/homebrew,skatsuta/homebrew,ilovezfs/homebrew,reelsense/homebrew,slyphon/homebrew,SuperNEMO-DBD/cadfaelbrew,joshfriend/homebrew,SteveClement/homebrew,TaylorMonacelli/homebrew,dutchcoders/homebrew,dericed/homebrew,johanhammar/homebrew,Linuxbrew/linuxbrew,dplarson/homebrew,dickeyxxx/homebrew,sferik/homebrew,ilovezfs/homebrew,zchee/homebrew,dalanmiller/homebrew,adamliter/homebrew,Angeldude/linuxbrew,yumitsu/homebrew,skinny-framework/homebrew,treyharris/homebrew,haihappen/homebrew,eighthave/homebrew,elgertam/homebrew,brunchboy/homebrew,thinker0/homebrew,georgschoelly/homebrew,apjanke/homebrew,booi/homebrew,ablyler/homebrew,MartinDelille/homebrew,dericed/homebrew,influxdb/homebrew,emcrisostomo/homebrew,saketkc/linuxbrew,haihappen/homebrew,chadcatlett/homebrew,ralic/homebrew,kevinastone/homebrew,lrascao/homebrew,esamson/homebrew,dickeyxxx/homebrew,kevinastone/homebrew,MartinDelille/homebrew,jarrettmeyer/homebrew,cprecioso/homebrew,tutumcloud/homebrew,afh/homebrew,yumitsu/homebrew,dalanmiller/homebrew,haihappen/homebrew,retrography/homebrew,mkrapp/homebrew,josa42/homebrew,scorphus/homebrew,quantumsteve/homebrew,muellermartin/homebrew,feelpp/homebrew,elgertam/homebrew,AlexejK/homebrew,sjackman/linuxbrew,optikfluffel/homebrew,theeternalsw0rd/homebrew,pcottle/homebrew,dericed/homebrew,nandub/homebrew,Homebrew/linuxbrew,menivaitsi/homebrew,theeternalsw0rd/homebrew,ralic/homebrew,influxdata/homebrew,filcab/homebrew,dongcarl/homebrew,dalanmiller/homebrew,liamstask/homebrew,mobileoverlord/homebrew-1,scorphus/homebrew,Angeldude/linuxbrew,sometimesfood/homebrew,jamer/homebrew,tutumcloud/homebrew,decors/homebrew,DoomHammer/linuxbrew,redpen-cc/homebrew,gawbul/homebrew,brunchboy/homebrew,esamson/homebrew,booi/homebrew,gawbul/homebrew,SuperNEMO-DBD/cadfaelbrew,SteveClement/homebrew,vigo/homebrew,keith/homebrew,skinny-framework/homebrew,afh/homebrew,alebcay/homebrew,nandub/homebrew,drbenmorgan/linuxbrew,gnubila-france/linuxbrew,skinny-framework/homebrew,3van/homebrew,SteveClement/homebrew,gicmo/homebrew,Asuranceturix/homebrew,optikfluffel/homebrew,base10/homebrew,sjackman/linuxbrew,Asuranceturix/homebrew,apjanke/homebrew,AlexejK/homebrew,apjanke/homebrew,georgschoelly/homebrew,dunn/homebrew,SteveClement/homebrew,mkrapp/homebrew,eighthave/homebrew,filcab/homebrew,feelpp/homebrew,marcwebbie/homebrew,zchee/homebrew,decors/homebrew