gcc 4.5, 4.6: Remove broken update-gcc.sh symlinks

-2
-1
pkgs/development/compilers/gcc/4.5/update-gcc.sh
··· 1 - ../4.4/update-gcc.sh
-1
pkgs/development/compilers/gcc/4.6/update-gcc.sh
··· 1 - ../4.4/update-gcc.sh