package/refpolicy: bump version to 2.20210908

package/refpolicy: bump version to 2.20210908

- Drop upstreamed patches
- Add Upstream status to remaining patch
- Update indentation in hash file (two spaces)
- Fix the following build failure with wireshark raised since commit
  975ab2fa88a0c94b362499ea8ad99222f335fb45 thanks to
  https://github.com/SELinuxProject/refpolicy/commit/d5c571c85567fe191fcc64dfb99b36788f806ceb:

 Compiling targeted policy.31
 env LD_LIBRARY_PATH="/tmp/instance-0/output-1/host/lib:/tmp/instance-0/output-1/host/usr/lib" /tmp/instance-0/output-1/host/usr/bin/checkpolicy -c 31 -U deny -S -O -E policy.conf -o policy.31
 policy/modules/apps/wireshark.te:96:ERROR 'unknown type xdg_downloads_t' at token ';' on line 645315:
 #line 96
	allow wireshark_t xdg_downloads_t:dir { getattr search open };
 checkpolicy:  error(s) encountered while parsing configuration
 make[1]: *** [Rules.monolithic:79: policy.31] Error 1

https://github.com/SELinuxProject/refpolicy/releases/tag/RELEASE_2_20210908

Fixes:
 - http://autobuild.buildroot.org/results/dfbc667e0c17072ddab89a03244f572d5234da50

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>