package/libapparmor: fix build on musl

Fix build of version 3.0.0 with musl. Since the apparmor and
libapparmor packages share the same sources, we also share their
patches: this is why the patch is added in package/libapparmor/3.0.0,
and a symlink package/apparmor/3.0.0 -> package/libapparmor/3.0.0 is
added.

Fixes:
 - http://autobuild.buildroot.org/results/22fb440240aa698acc68f026be790d5366c8f908

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

package/apparmor/3.0.0

@@ -0,0 +1 @@
+../libapparmor/3.0.0/

package/libapparmor/3.0.0/0001-libapparmor-add-missing-include-for-socklen_t.patch

@@ -0,0 +1,35 @@
+From 47263a3a74d7973e7a54b17db6aa903701468ffd Mon Sep 17 00:00:00 2001
+From: Patrick Steinhardt <ps@pks.im>
+Date: Sat, 3 Oct 2020 20:37:55 +0200
+Subject: [PATCH] libapparmor: add missing include for `socklen_t`
+
+While `include/sys/apparmor.h` makes use of `socklen_t`, it doesn't
+include the `<sys/socket.h>` header to make its declaration available.
+While this works on systems using glibc via transitive includes, it
+breaks compilation on musl libc.
+
+Fix the issue by including the header.
+
+Signed-off-by: Patrick Steinhardt <ps@pks.im>
+[Retrieved from:
+https://gitlab.com/apparmor/apparmor/-/commit/47263a3a74d7973e7a54b17db6aa903701468ffd]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ libraries/libapparmor/include/sys/apparmor.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/libraries/libapparmor/include/sys/apparmor.h b/libraries/libapparmor/include/sys/apparmor.h
+index 32892d065..d70eff947 100644
+--- a/libraries/libapparmor/include/sys/apparmor.h
++++ b/libraries/libapparmor/include/sys/apparmor.h
+@@ -21,6 +21,7 @@
+ #include <stdbool.h>
+ #include <stdint.h>
+ #include <unistd.h>
++#include <sys/socket.h>
+ #include <sys/types.h>
+ 
+ #ifdef __cplusplus
+-- 
+GitLab
+