What is the value of TARGET_C99_FUNCTIONS on Darwin?

[Dominique Dhumieres]

Following the discussions for PR30969, PR30980, and PR31161,
it appears that TARGET_C99_FUNCTIONS is not set on OSX 10.3.9
nor OSX 10.4.9. Is this in line with the comment

/* Old versions of Mac OS/Darwin don't have C99 functions available.  */

in gcc/config/rs6000/darwin.h? and

#undef TARGET_C99_FUNCTIONS
#define TARGET_C99_FUNCTIONS                                    \
  (TARGET_64BIT                                                 \
   || strverscmp (darwin_macosx_version_min, "10.3") >= 0)

TIA

Dominique