Fixed several issues on PE/ELF/MACH0

- relocs, entry0 vaddr and baddr
- fix tiny.elf crash (null deref on *bin ptr)
Colorize S? and shrink sz/vsz from %08 to %04
Ignore sections at vaddr=0 (fixes some crappy elfs)
Add radare2 spec file
Fix udis86 regression

$ rasm2 -o 0x100005f8f -a x86 -b32 -d e800000000
call 0x5f94

$ rasm2 -o 0x100005f8f -a x86.cs -b32 -d e800000000
call 0x100005f94
Fix r_reg_next_diff (thanks defragger!)
More improvements for cygwin building