ide/debugger; crossplatform.mk: (#1016) Ensure we can build out of the box as 32...

ide/debugger; crossplatform.mk: (#1016) Ensure we can build out of the box as 32 bit on 32 bit Windows
- Detecting 32 bit system Windows systems and auto-setting -m32 (Currently checking for ProgramFiles(x86) env var)
- Built output will be in e.g. release.win32, not release.win32.x32 as ARCH is set after ARCH_SUFFIX
- GDB executable used on Windows has been updated to match executables supplied with the installer:
   'i686-w64-mingw32-gdb' for the 32 bit version, 'gdb' for the 64 bit version