p11-kit: upgrade 0.23.21 -> 0.23.22

https://github.com/p11-glue/p11-kit/releases/tag/0.23.22

Release notes:
Fix memory-safety issues that affect the RPC protocol (CVE-2020-29361, CVE-2020-29362, and CVE-2020-29363), discovered and fixed by David Cook
anchor: Prefer persistent format when storing anchor [#329]
common: Fix infloop in p11_path_build [#326, #327]
proxy: C_CloseAllSessions: Make sure that calloc args are non-zero [#325]
common: Check for a NULL locale before freeing it [#321]
Build and test fixes [#313, #315, #317, #318, #319, #323, #330, #333, #334, #335, #338, #339]

https://github.com/p11-glue/p11-kit/commit/c4e75e10021ce86ab42682ea4936dce94ced2f77


patch to fix trailing newline using custom_target() caused error
with DISTRO_FEATURES api-documentation due to meson bugs, enable
manpages PACKAGECONFIG should prevent this error.
| warning: failed to load external entity "../version.xml"
| ../p11-kit-docs.xml:11: parser error : Failure to process entity version
| 		<releaseinfo>for p11-kit &version;</releaseinfo>
| 		                                  ^
| ../p11-kit-docs.xml:11: parser error : Entity 'version' not defined
| 		<releaseinfo>for p11-kit &version;</releaseinfo>
| 		                                  ^
| unable to parse ../p11-kit-docs.xml

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>