package/file: fix musl compile issue

It is not totally clear which update is responsible for the
breakage. The breakage has been occurring for as long as Jan 2022.
Therefore it should be backported to older supported buildroot releases.

Add a patch from Gentoo people, also reported Upstream to fix the
issue.

Fixes:

 http://autobuild.buildroot.org/results/abf/abfe66cec3680d396c5774ba492f34599e513edc/

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 71f36ef9385f860683b5c39a2c3af9f821833c5a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/file/0001-file-seccomp-fstatat64-musl.patch

@@ -0,0 +1,32 @@
+From 8c13923a8e17a02be0989649b2edc20124816729 Mon Sep 17 00:00:00 2001
+From: Mike Gilbert <floppym@gentoo.org>
+Date: Tue, 15 Jun 2021 16:08:22 -0400
+Subject: [PATCH] seccomp: undef fstatat64 to avoid build failure on musl
+
+sys/stat.h in musl does this:
+
+  #define fstatat64 fstatat
+
+Counteract this with an #undef.
+
+Bug: https://bugs.gentoo.org/789336
+Bug: https://bugs.astron.com/view.php?id=473
+Signed-off-by: Mike Gilbert <floppym@gentoo.org>
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+Upstream: N/A under discussion
+---
+ src/seccomp.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/seccomp.c b/src/seccomp.c
+index 5a39ee45..d2a1139a 100644
+--- a/src/seccomp.c
++++ b/src/seccomp.c
+@@ -205,6 +205,7 @@ enable_sandbox_full(void)
+ #endif
+  	ALLOW_RULE(fstat64);
+ #ifdef __NR_fstatat64
++#undef fstatat64
+ 	ALLOW_RULE(fstatat64);
+ #endif
+ 	ALLOW_RULE(futex);