SPARC: add prlimit and prlimit64 in <bits/resource.h> (BZ #16943)

prlimit and prlimit64 have been added in the main <bits/resource.h>, but
not in the SPARC specific version. Fix that.

Note: this is Debian bug#703559, reported by Emilio Pozuelo Monfort
<pochu@debian.org>

(cherry picked from commit d16e6ec7ca2c861ba681e3a2fbd431725774292e)
Fix sparc memcpy data corruption when using niagara2 optimized routines.

	* sysdeps/sparc/sparc64/multiarch/memcpy-niagara2.S: Add missing
	membar to avoid block loads/stores to overlap previous stores.