libcap: Update to version 2.64

libcap: Update to version 2.64

- Update from version 2.63 to 2.64
- Update of rootfile
- Change sed line to ensure removal of static libs - environment names for static libraries
   changed.
- Changelog
   2.64
	    Fix memory leak in libpsx at program exit. (Bug: 215551 reported by Kalen Hall)
	    Be more resilient to CGo configuration with Go compiler when building tests.
             (Bug: 215603)
	    Fix cap_*prctl() return code/errno handling.  (Bug: 215772 reported by Anderson
             Toshiyuki Sasaki)
	    Minor clarification to cap_get_pid() man page concerning pid value within
             namespaces. (Bug: 215812)

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>