Makefiles: Force building 32 or 64 bit by setting ARCH=32 or 64

Makefiles: Force building 32 or 64 bit by setting ARCH=32 or 64
- When ARCH is specified, build output goes in .x32 or .x64
- Fixed proper detection of Program Files on Windows
- Got rid of compiler setting FORCE_32_BIT and FORCE_64_BIT (Replaced by ARCH setting)
- Automatically installing in multilib path on Linux when not building .deb
- Improved attempts to load libecere in alternate paths (Thanks Niraj)
- Fixed all SDK makefiles to use $(COMPILER_SUFFIX)$(DEBUG_SUFFIX)