Defines starting with `w' in machdep/i386/fp_emul

• word_frac1 machdep/i386/fp_emul/fp_e80387.h:94
• word_frac2 machdep/i386/fp_emul/fp_e80387.h:95
• wrap_around_constant machdep/i386/fp_emul/fp_e80387.h:299