Hi,

This patch fixes some Makefile variables according to these Gnulib NEWS
entries:

2023-01-07  fdatasync       Link with $(FDATASYNC_LIB) instead of
                            $(LIB_FDATASYNC).
[...]
2023-01-07  clock_time      Link with $(CLOCK_TIME_LIB) instead of
                            $(LIB_CLOCK_GETTIME).

IIRC these libraries are only needed on older Glibc, Solaris, Android,
and probably didn't break builds on modern platforms.

Collin