libselinux: update to version 3.3

libselinux: update to version 3.3

Update VERSIONs to 3.3 for release.
libselinux: Fix potential undefined shifts
Update VERSIONs to 3.3-rc3 for release.
Update VERSIONs to 3.3-rc2 for release.
libselinux/utils: drop requirement to combine compiling and linking
Update VERSIONs and Python bindings version to 3.3-rc1 for release
Improve error message for label file validation
libselinux: replace strerror by %m
libselinux: silence -Wextra-semi-stmt warning
libselinux/utils/getseuser.c: fix build with gcc 4.8
selinux.8: document how mount flag nosuid affects SELinux
libselinux: fix typo
libselinux: improve getcon(3) man page
libselinux: selinux_status_open: return 1 in fallback mode
libselinux: do not use status page fallback mode internally
libselinux: make selinux_status_open(3) reentrant
libselinux: avc_destroy(3) closes status page
libselinux: label_file.c: fix indent
libselinux: regex: unify parameter names
libselinux: sidtab_sid_stats(): unify parameter name
libselinux: drop redundant casts to the same type
libselinux: label_db::db_init(): open file with CLOEXEC mode
libselinux: matchpathcon: free memory on realloc failure
libselinux: label_file::init(): do not pass NULL to strdup
libselinux: init_selinux_config(): free resources on error
libselinux: matchmediacon(): close file on error
libselinux: store_stem(): do not free possible non-heap object
libselinux: getdefaultcon: free memory on multiple same arguments
libselinux: setexecfilecon(): drop dead assignment
libselinux: label_media::init(): drop dead assignment
libselinux: label_x::init(): drop dead assignment
libselinux: context_new(): drop dead assignment
libselinux: exclude_non_seclabel_mounts(): drop unused variable
libselinux: getconlist: free memory on multiple level arguments
libselinux: selabel_get_digests_all_partial_matches: free memory after FTS_D block
libselinux: selinux_restorecon: mark local variable static
libselinux: avcstat: use standard length modifier for unsigned long long
libselinux: sefcontext_compile: mark local variable static
libselinux: Sha1Finalise(): do not discard const qualifier
libselinux: label_common(): do not discard const qualifier
libselinux: selinux_file_context_cmp(): do not discard const qualifier
libselinux: sidtab_hash(): do not discard const qualifier
libselinux: silence -Wstringop-overflow warning from gcc 10.3.1
libselinux: selinux_check_passwd_access_internal(): respect deny_unknown
libselinux: do not duplicate make target when going into subdirectory

Signed-off-by: Dominick Grift <dominick.grift@defensec.nl>