shutils/build_funcs: "custom-install" pkgs can use do_build() func.
shutils/build_funcs: "custom-install" pkgs can use do_build() func.

That means that you can now build "custom-install" build_style
packages in two stages, one for building and one for installation.

--HG--
extra : convert_revision : 4fd76075a1a0bd173854272437c6ca3b263a6f62

okapia/void-packages,tjohann/void-packages,okapia/void-packages,radare/void-packages,aisamanra/void-packages,opsaaspo/void-packages,aisamanra/void-packages,bougyman/void-packages,ylixir/void-packages,ayghor/void-packages,uriah0/void-packages,floGik/void-packages,allan/void-packages,skrzyp/void-packages,floGik/void-packages,floGik/void-packages,eddyb/void-packages,eddyb/void-packages,deathsyn/void-packages,jprjr/void-packages,coredumb/void-packages,LockeAnarchist/void-packages,bougyman/void-packages,ayghor/void-packages,gangsterakato/void-packages,uriah0/void-packages,kulinacs/void-packages,kylesusername/void-packages,kulinacs/void-packages,necrophcodr/void-packages,opsaaspo/void-packages,esantoro/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,samuelchodur/void-packages,kulinacs/void-packages,EaterOfCode/void-packages,kylesusername/void-packages,WKuipers/void-packages,Bubble-be/void-packages,eddyb/void-packages,juliendehos/void-packages,liwakura/void-packages,deathsyn/void-packages,meowstars/void-packages,kokakolako/void-packages,kokakolako/void-packages,lodvaer/void-packages,k00mi/void-packages,allan/void-packages,Bubble-be/void-packages,coredumb/void-packages,floGik/void-packages,tjohann/void-packages,tjohann/void-packages,kokakolako/void-packages,kokakolako/void-packages,meowstars/void-packages,NeoChontrix/void-packages,WilliamO7/void-packages,rfnash/void-packages,WilliamO7/void-packages,kokakolako/void-packages,uriah0/void-packages,WilliamO7/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,coredumb/void-packages,floGik/void-packages,WKuipers/void-packages,WKuipers/void-packages,LockeAnarchist/void-packages,jprjr/void-packages,kylesusername/void-packages,k00mi/void-packages,k00mi/void-packages,ayghor/void-packages,skrzyp/void-packages,okapia/void-packages,ayghor/void-packages,opsaaspo/void-packages,Bubble-be/void-packages,ylixir/void-packages,opsaaspo/void-packages,liwakura/void-packages,jprjr/void-packages,kokakolako/void-packages,WKuipers/void-packages,asafo/void-packages,WilliamO7/void-packages,esantoro/void-packages,ayghor/void-packages,juliendehos/void-packages,WilliamO7/void-packages,skrzyp/void-packages,necrophcodr/void-packages,esantoro/void-packages,necrophcodr/void-packages,Bubble-be/void-packages,gangsterakato/void-packages,ylixir/void-packages,NeoChontrix/void-packages,kulinacs/void-packages,liwakura/void-packages,asafo/void-packages,opsaaspo/void-packages,lodvaer/void-packages,LockeAnarchist/void-packages,EaterOfCode/void-packages,jprjr/void-packages,meowstars/void-packages,uriah0/void-packages,deathsyn/void-packages,kylesusername/void-packages,gangsterakato/void-packages,juliendehos/void-packages,deathsyn/void-packages,okapia/void-packages,samuelchodur/void-packages,eddyb/void-packages,lodvaer/void-packages,EaterOfCode/void-packages,radare/void-packages,LockeAnarchist/void-packages,juliendehos/void-packages,floGik/void-packages,aisamanra/void-packages,allan/void-packages,rfnash/void-packages,LockeAnarchist/void-packages,rfnash/void-packages,NeoChontrix/void-packages,radare/void-packages,radare/void-packages,aisamanra/void-packages,kulinacs/void-packages,coredumb/void-packages,asafo/void-packages,kylesusername/void-packages,juliendehos/void-packages,allan/void-packages,ylixir/void-packages,gangsterakato/void-packages,Bubble-be/void-packages,WKuipers/void-packages,skrzyp/void-packages,kulinacs/void-packages,gangsterakato/void-packages,samuelchodur/void-packages,bougyman/void-packages,EaterOfCode/void-packages,k00mi/void-packages,rfnash/void-packages,aisamanra/void-packages,EaterOfCode/void-packages,coredumb/void-packages,Bubble-be/void-packages,allan/void-packages,opsaaspo/void-packages,bougyman/void-packages,coredumb/void-packages,tjohann/void-packages,uriah0/void-packages,ayghor/void-packages,okapia/void-packages,radare/void-packages,ylixir/void-packages,NeoChontrix/void-packages,liwakura/void-packages,meowstars/void-packages,lodvaer/void-packages,liwakura/void-packages,asafo/void-packages,WKuipers/void-packages,bougyman/void-packages,tjohann/void-packages,WilliamO7/void-packages,esantoro/void-packages,eddyb/void-packages,liwakura/void-packages,skrzyp/void-packages,lodvaer/void-packages,jprjr/void-packages,juliendehos/void-packages,k00mi/void-packages,k00mi/void-packages,asafo/void-packages,radare/void-packages,esantoro/void-packages,deathsyn/void-packages,meowstars/void-packages,samuelchodur/void-packages,rfnash/void-packages,samuelchodur/void-packages,jprjr/void-packages,gangsterakato/void-packages,lodvaer/void-packages