Factor out some common code between X86 and X86_64, and supply *_real versions of all floating point intrinsics that exist whether reals are 80-bit or 64-bit.

#ifndef _GNUC_H
#define _GNUC_H 1

int memicmp(const char *s1, const char *s2, int n);
int stricmp(const char *s1, const char *s2);

#endif