[openbeos] GCC headers in headers/posix

Howdy,

there are some gcc headers in our headers/posix directory (float.h, new, 
varargs.h). Since there was no explanation, why they are there, I suppose, 
the old build system didn't add the gcc headers dir to the search paths (an 
XXX in limits.h suggest as much). Since the new build system should do that 
correctly, I guess, we can remove those headers now (and fix limits.h). Any 
objections?

CU, Ingo

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