package/git: add xdg SELinux module

xdg SELinux module is needed to avoid the following build failure raised
since bump of refpolicy to version 2.20220106 in commit
f6691d122ce25fc580ca88243f79f75cc2808ca7 and
https://github.com/SELinuxProject/refpolicy/commit/64e637d895c516d7a6b6cbcd46b187136279fddd:

 policy/modules/services/git.te:121:ERROR 'attribute xdg_config_type is not declared' at token ';' on line 115358:
 	typeattribute git_xdg_config_t xdg_config_type;
 #line 121
 checkpolicy:  error(s) encountered while parsing configuration
 Rules.monolithic:78: recipe for target 'policy.30' failed

Fixes:
 - http://autobuild.buildroot.org/results/98d5b3db313000855721c0ad994951fe8cc781c0

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/git/git.mk

@@ -10,7 +10,7 @@ GIT_SITE = $(BR2_KERNEL_MIRROR)/software/scm/git
 GIT_LICENSE = GPL-2.0, LGPL-2.1+
 GIT_LICENSE_FILES = COPYING LGPL-2.1
 GIT_CPE_ID_VENDOR = git-scm
-GIT_SELINUX_MODULES = apache git
+GIT_SELINUX_MODULES = apache git xdg
 GIT_DEPENDENCIES = zlib $(TARGET_NLS_DEPENDENCIES)
 # We're patching configure.ac
 GIT_AUTORECONF = YES