cc/gcc: add 4.7.3 and 4.6.4 bug-fixes releases

Bring the appropriate patches along, too.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

 # windows config options

 ## depends on ARCH_x86

 ##

 ## select WINDOWS

 ##

 ## help Build a toolchain targeting systems running Windows as host