Remove unused get_clockfreq files

The patch 6e8ba7fd meant to remove the all get_clockfreq.c.  This
patch removes the missing files for sparcv9 and x86_64.

Checked against a build to x86_64-linux-gnu and sparcv9-linux-gnu.

	* sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/get_clockfreq.c:
	Remove file.
	* sysdeps/unix/sysv/linux/x86_64/get_clockfreq.c: Likewise.