cobol: Honor HAVE_CLOCK_GETTIME and HAVE_GETTIMEOFDAY. [PR119975]

cobol: Honor HAVE_CLOCK_GETTIME and HAVE_GETTIMEOFDAY. [PR119975]

These changes cause genapi.cc to use whichever of clock_gettime() or
gettimeofday() are available.  This prevents compilation errors on
systems where clock_gettime() is not available.

gcc/cobol/ChangeLog:

	PR cobol/119975
	* genapi.cc (parser_intrinsic_call_0): Use get_time_64() function.
	* genutil.cc (get_time_64): Definition created.
	* genutil.h (get_time_64): Declaration created.

(cherry picked from commit 8fc9e03a70fd08b54449b05833b00e7f8ad01c25)