add OS X clang patch to 4.01.0+PIC and +fp

After this patch, all switches that are supposed to compile on OS X
using clang have this patch:

$grep -Rl bd7fa181cb64742c3b6cbb8ee13436554eb18cd7 *
4.01.0/4.01.0.comp
4.01.0+32bit/4.01.0+32bit.comp
4.01.0+BER.comp
4.01.0+PIC/4.01.0+PIC.comp
4.01.0+fp/4.01.0+fp.comp
4.01.0+jocaml/4.01.0+jocaml.comp
4.01.0+open-types/4.01.0+open-types.comp
Merge pull request #2090 from maverickwoo/master

add OS X clang patch to 4.01.0+PIC and +fp