Fix for VPHI_SIZE on 32-bit

This will be properly resolved with a backend refactor
Rename UCC_ARCH to UCC_BINFMT
Platform and OS/triple file and enum cleanup
Fixed -m32 parsing
cpp: learnt -m32 (__i?86__ vs __x86_64__)
Moved defs.h to common lib/arch folder
Fix __syscall convention
i386 arch lib code
x86 32/64-bit agnostic, barring long long and floats
Fix 64-bit sub-arch
Dependency update
Pass 32/64-bit architecture decision from -m32/64 to `as'
configure script refactor
Only show directories for target choices
configure/lib support for 32 vs. 64 bit builds
Main 32-bit TODOs