Drop support for VC10 by updating compiler.pri for VC12 default flags
Drop support for VC10 by updating compiler.pri for VC12 default flags

This patch updates the compiler flags under the assumption
of us using VC12. This mostly consists of dropping flags
this compiler already set by default as well as removing
a conditional. This might even still build from this point
on VC10 support is considered to be dropped.

austinliou/mumble,unascribed/mumble,Natenom/mumble,Lartza/mumble,mbax/mumble,bheart/mumble,austinliou/mumble,richard227/mumble,unascribed/mumble,ccpgames/mumble,Zopieux/mumble,Githlar/mumble,mbax/mumble,feld/mumble,Lartza/mumble,SuperNascher/mumble,unascribed/mumble,LuAPi/mumble,bheart/mumble,SuperNascher/mumble,austinliou/mumble,Githlar/mumble,ccpgames/mumble,ccpgames/mumble,richard227/mumble,LuAPi/mumble,bheart/mumble,feld/mumble,richard227/mumble,richard227/mumble,Githlar/mumble,feld/mumble,austinliou/mumble,Lartza/mumble,unascribed/mumble,feld/mumble,ccpgames/mumble,unascribed/mumble,bheart/mumble,unascribed/mumble,Zopieux/mumble,richard227/mumble,feld/mumble,ccpgames/mumble,SuperNascher/mumble,Zopieux/mumble,Natenom/mumble,LuAPi/mumble,Zopieux/mumble,niko20010/mumble,Githlar/mumble,SuperNascher/mumble,austinliou/mumble,unascribed/mumble,Keridos/mumble,mbax/mumble,bheart/mumble,mbax/mumble,Natenom/mumble,Keridos/mumble,Zopieux/mumble,austinliou/mumble,unascribed/mumble,feld/mumble,SuperNascher/mumble,ccpgames/mumble,bheart/mumble,niko20010/mumble,feld/mumble,mbax/mumble,Lartza/mumble,LuAPi/mumble,austinliou/mumble,Keridos/mumble,LuAPi/mumble,SuperNascher/mumble,Natenom/mumble,mbax/mumble,bheart/mumble,Lartza/mumble,niko20010/mumble,Zopieux/mumble,Lartza/mumble,ccpgames/mumble,Keridos/mumble,Keridos/mumble,niko20010/mumble,SuperNascher/mumble,SuperNascher/mumble,niko20010/mumble,niko20010/mumble,richard227/mumble,Natenom/mumble,Lartza/mumble,niko20010/mumble,niko20010/mumble,Natenom/mumble,Natenom/mumble,LuAPi/mumble,mbax/mumble,Githlar/mumble,austinliou/mumble,feld/mumble,richard227/mumble,mbax/mumble,ccpgames/mumble,Githlar/mumble,Zopieux/mumble,Githlar/mumble,richard227/mumble,Zopieux/mumble,Keridos/mumble,Lartza/mumble,Githlar/mumble,bheart/mumble,Keridos/mumble,SuperNascher/mumble,Keridos/mumble,Natenom/mumble,LuAPi/mumble,LuAPi/mumble,LuAPi/mumble