Relax/modify this sanity check. Only warn if libjvm.so has a need for __fabsf.

WARNING: The file /usr/include/iso/math_iso.h may cause
         binaries built on this 5.9 machine to fail on other
         5.9 machines that do not have the matching libm.so.
         This is due to new externals such as __fabsf().
         Remove the libm patch, or manually change the file
         /usr/include/iso/math_iso.h to the pre-patch state.
         Use 'showrev -p | fgrep libm' to find the libm patch number.