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pull in gcc-objc

Upstream bug:
https://bugzilla.xfce.org/show_bug.cgi?id=9709

it broke 'abuild -R'

prefix global vars with _

This should fix issue with sdl[1] and apps that does lots of dlopen/dlclose calls
with complicated deps.

[1] see commit be918662

- Seem slike we need to run configure in opcodes separately.
- fix cpuid asm to not use ebx for our PIC