libseccomp: fix cross compile error for mips

Backport patch to fix cross compile error for mips:

| syscalls.h:44:6: error: expected identifier or '(' before numeric constant
|    44 |  int mips;
|       |      ^~~~

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

recipes-security/libseccomp/files/fix-mips-build-failure.patch

@@ -0,0 +1,49 @@
+Backport patch to fix cross compile error for mips:
+
+| syscalls.h:44:6: error: expected identifier or '(' before numeric constant
+|    44 |  int mips;
+|       |      ^~~~
+
+Upstream-Status: Submitted [https://github.com/seccomp/libseccomp/pull/279/commits/04c519e5]
+
+Signed-off-by: Kai Kang <kai.kang@windriver.com>
+
+From 04c519e5b1de53592e98307813e5c6db7418f91b Mon Sep 17 00:00:00 2001
+From: Paul Moore <paul@paul-moore.com>
+Date: Sun, 2 Aug 2020 09:57:39 -0400
+Subject: [PATCH] build: undefine "mips" to prevent build problems for MIPS
+ targets
+
+It turns out that the MIPS GCC compiler defines a "mips" cpp macro
+which was resulting in build failures on MIPS so we need to
+undefine the "mips" macro during build.  As this should be safe
+to do in all architectures, just add it to the compiler flags by
+default.
+
+This was reported in the following GH issue:
+* https://github.com/seccomp/libseccomp/issues/274
+
+Reported-by: Rongwei Zhang <pudh4418@gmail.com>
+Suggested-by: Rongwei Zhang <pudh4418@gmail.com>
+Signed-off-by: Paul Moore <paul@paul-moore.com>
+---
+ configure.ac | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 40d9dcbb..3e877348 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -65,9 +65,11 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+ 
+ dnl ####
+ dnl build flags
++dnl NOTE: the '-Umips' is here because MIPS GCC compilers "helpfully" define it
++dnl       for us which wreaks havoc on the build
+ dnl ####
+ AM_CPPFLAGS="-I\${top_srcdir}/include -I\${top_builddir}/include"
+-AM_CFLAGS="-Wall"
++AM_CFLAGS="-Wall -Umips"
+ AM_LDFLAGS="-Wl,-z -Wl,relro"
+ AC_SUBST([AM_CPPFLAGS])
+ AC_SUBST([AM_CFLAGS])

recipes-security/libseccomp/libseccomp_2.5.0.bb

@@ -10,6 +10,7 @@ SRCREV = "f13f58efc690493fe7aa69f54cb52a118f3769c1"
 
 SRC_URI = "git://github.com/seccomp/libseccomp.git;branch=release-2.5 \
            file://run-ptest \
+           file://fix-mips-build-failure.patch \
 "
 
 COMPATIBLE_HOST_riscv32 = "null"