configure: strip "rc" from Python version number
configure: strip "rc" from Python version number

Fixes #279.

watonyweng/node-gyp,glosee/node-gyp,robertkowalski/node-gyp,TooTallNate/node-gyp,beatle/node-gyp,saper/node-gyp,icosahedron/node-gyp,abougouffa/node-gyp,tepez/node-gyp,Karnith/node-gyp,fengmk2/node-gyp,litmit/node-gyp,CodeJockey/node-ninja,implausible/pangyp,camsong/node-gyp,beatle/node-gyp,nishant8BITS/node-gyp,rvagg/pangyp,iWuzHere/node-gyp,kapouer/node-gyp,watonyweng/node-gyp,saper/node-gyp,iWuzHere/node-gyp,Glavin001/node-gyp,Glavin001/node-gyp,purplecode/node-gyp,svr93/node-gyp,atiti/pangyp,aredridel/node-gyp,yorkie/node-gyp,isaacs/node-gyp,purplecode/node-gyp,vany-egorov/node-gyp,samccone/node-gyp,yorkie/node-gyp,litmit/node-gyp,robertkowalski/node-gyp,watonyweng/node-gyp,mcanthony/node-gyp,vany-egorov/node-gyp,JayBeavers/node-gyp,isaacs/node-gyp,beatle/node-gyp,jfhenriques/node-gyp,watonyweng/node-gyp,tepez/node-gyp,MiniGod/nw-gyp,prantlf/node-gyp,richardcypher/node-gyp,bnoordhuis/node-gyp,tempbottle/node-gyp,MiniGod/nw-gyp,jsdevel/node-gyp,iWuzHere/node-gyp,fengmk2/node-gyp,fredericosilva/node-gyp,purplecode/node-gyp,rvagg/pangyp,aredridel/pangyp,jfhenriques/node-gyp,beatle/node-gyp,vany-egorov/node-gyp,nodejs/node-gyp,kefo/node-gyp,JacksonTian/node-gyp,tmpvar/tmpvar-pangyp,getwe/node-gyp,nodegit/node-gyp,TooTallNate/node-gyp,svr93/node-gyp,abougouffa/node-gyp,bnoordhuis/node-gyp,nishant8BITS/node-gyp,richardcypher/node-gyp,tmpvar/tmpvar-pangyp,tempbottle/node-gyp,litmit/node-gyp,iarna/node-gyp,othiym23/node-gyp,iarna/node-gyp,CodeJockey/node-ninja,JayBeavers/node-gyp,SonicHedgehog/node-gyp,nwjs/nw-gyp,kapouer/node-gyp,SonicHedgehog/node-gyp,robertkowalski/node-gyp,jfhenriques/node-gyp,aredridel/pangyp,mcanthony/node-gyp,implausible/pangyp,litmit/node-gyp,fengmk2/node-gyp,pombredanne/pangyp,getwe/node-gyp,TooTallNate/node-gyp,richardcypher/node-gyp,JayBeavers/node-gyp,Glavin001/node-gyp,TooTallNate/node-gyp,CWHopkins/node-gyp,bnoordhuis/node-gyp,mcanthony/node-gyp,othiym23/node-gyp,CWHopkins/node-gyp,beatle/node-gyp,spacelis/node-gyp,aredridel/node-gyp,samccone/node-gyp,rvagg/pangyp,CWHopkins/node-gyp,TooTallNate/node-gyp,JacksonTian/node-gyp,tempbottle/node-gyp,isaacs/node-gyp,refack/node-gyp,tempbottle/node-gyp,prantlf/node-gyp,abougouffa/node-gyp,Fishrock123/node-gyp,JayBeavers/node-gyp,nishant8BITS/node-gyp,prantlf/node-gyp,CodeJockey/node-ninja,samccone/node-gyp,nwjs/nw-gyp,atiti/pangyp,pmq20/node-gyp,jqk6/node-gyp,pmq20/node-gyp,nishant8BITS/node-gyp,pombredanne/pangyp,aredridel/pangyp,icosahedron/node-gyp,spacelis/node-gyp,jsdevel/node-gyp,purplecode/node-gyp,CWHopkins/node-gyp,tepez/node-gyp,nodejs/node-gyp,refack/node-gyp,nodejs/node-gyp,othiym23/node-gyp,saper/node-gyp,Karnith/node-gyp,nodegit/node-gyp,watonyweng/node-gyp,caruccio/node-gyp,camsong/node-gyp,isaacs/node-gyp,SonicHedgehog/node-gyp,fengmk2/node-gyp,richardcypher/node-gyp,spacelis/node-gyp,nwjs/nw-gyp,fredericosilva/node-gyp,atiti/pangyp,aredridel/node-gyp,getwe/node-gyp,glosee/node-gyp,tepez/node-gyp,caruccio/node-gyp,pombredanne/pangyp,Fishrock123/node-gyp,getwe/node-gyp,JacksonTian/node-gyp,Glavin001/node-gyp,kefo/node-gyp,SonicHedgehog/node-gyp,nwjs/nw-gyp,robertkowalski/node-gyp,iarna/node-gyp,yorkie/node-gyp,svr93/node-gyp,fengmk2/node-gyp,jsdevel/node-gyp,jfhenriques/node-gyp,nodegit/node-gyp,camsong/node-gyp,nodegit/node-gyp,aredridel/node-gyp,glosee/node-gyp,JacksonTian/node-gyp,MiniGod/nw-gyp,nodejs/node-gyp,fredericosilva/node-gyp,camsong/node-gyp,atiti/pangyp,robertkowalski/node-gyp,jfhenriques/node-gyp,abougouffa/node-gyp,iarna/node-gyp,tempbottle/node-gyp,justinmchase/node-gyp,MiniGod/nw-gyp,glosee/node-gyp,SonicHedgehog/node-gyp,kapouer/node-gyp,yorkie/node-gyp,jqk6/node-gyp,abougouffa/node-gyp,refack/node-gyp,vany-egorov/node-gyp,bnoordhuis/node-gyp,kefo/node-gyp,svr93/node-gyp,Karnith/node-gyp,rvagg/pangyp,justinmchase/node-gyp,kapouer/node-gyp,aredridel/pangyp,implausible/pangyp,jqk6/node-gyp,othiym23/node-gyp,nishant8BITS/node-gyp,getwe/node-gyp,nwjs/nw-gyp,spacelis/node-gyp,CodeJockey/node-ninja,pmq20/node-gyp,implausible/pangyp,fredericosilva/node-gyp,CodeJockey/node-ninja,pombredanne/pangyp,rvagg/pangyp,icosahedron/node-gyp,tmpvar/tmpvar-pangyp,spacelis/node-gyp,saper/node-gyp,icosahedron/node-gyp,implausible/pangyp,aredridel/node-gyp,yorkie/node-gyp,jqk6/node-gyp,Fishrock123/node-gyp,mcanthony/node-gyp,iarna/node-gyp,jsdevel/node-gyp,justinmchase/node-gyp,atiti/pangyp,caruccio/node-gyp,samccone/node-gyp,CWHopkins/node-gyp,JacksonTian/node-gyp,kefo/node-gyp,nodejs/node-gyp,jsdevel/node-gyp,Glavin001/node-gyp,kapouer/node-gyp,refack/node-gyp,othiym23/node-gyp,bnoordhuis/node-gyp,aredridel/pangyp,jqk6/node-gyp,icosahedron/node-gyp,camsong/node-gyp,tepez/node-gyp,iWuzHere/node-gyp,pmq20/node-gyp,tmpvar/tmpvar-pangyp,pombredanne/pangyp,Karnith/node-gyp,caruccio/node-gyp,justinmchase/node-gyp,MiniGod/nw-gyp,JayBeavers/node-gyp,fredericosilva/node-gyp,saper/node-gyp,richardcypher/node-gyp,samccone/node-gyp,iWuzHere/node-gyp,isaacs/node-gyp,refack/node-gyp,pmq20/node-gyp,prantlf/node-gyp,svr93/node-gyp,justinmchase/node-gyp,glosee/node-gyp,tmpvar/tmpvar-pangyp,mcanthony/node-gyp,Karnith/node-gyp,litmit/node-gyp,purplecode/node-gyp,Fishrock123/node-gyp,kefo/node-gyp,caruccio/node-gyp,nodegit/node-gyp,prantlf/node-gyp