* write.c (fixup_segment): Delete {SEG,GLOBAL}_DIFF_ALLOWED code,

    * write.c (fixup_segment): Delete {SEG,GLOBAL}_DIFF_ALLOWED code,
        it was PA specific and is no longer needed (it's now handled
        within the PA backend).
        * config/tc-hppa.h (SEG_DIFF_ALLOWED): Delete definition.
        * config/tc-hppa.c (fix_new_hppa): If the subtract symbol for
        a fixup is $global$ change it to NULL as $global$ is really only
        needed long enough to determine the base type of relocation to use.