fix win32 gmake with win64 VC with 32 bit GCC in PATH build failure

The assignment of PROCESSOR_ARCHITEW6432 to PROCESSOR_ARCHITECTURE near
the "When we are running from a 32bit cmd.exe on AMD64 then" comment
doesn't happen if WIN64 var was already assigned to. Do the 32/64 auto
detection only for GCC builds, not for VC builds. I not implementing 32/64
and cl version (CCTYPE setting) detection by parsing stdout of "cl<enter>"
with batch and gmake syntax at this time.

failure message:
generate_uudmap.obj : fatal error LNK1112: module machine type 'x64'
conflicts with target machine type 'X86'
GNUmakefile:1416: recipe for target '..\generate_uudmap.exe' failed
gmake: *** [..\generate_uudmap.exe] Error 2

0 files changed, 0 insertions, 0 deletions