Try to fix strace compilation

Signed-off-by: Michal Hrusecky <michal.hrusecky@nic.cz>

patches/openwrt/to-upstream/0001-strace-Check-for-mpers-support.patch

+From 6e1e86b3d95c0dda5a0e0ffa7b0bfcef16bfc98a Mon Sep 17 00:00:00 2001
+From: Michal Hrusecky <michal.hrusecky@nic.cz>
+Date: Wed, 20 Jun 2018 10:40:11 +0200
+Subject: [PATCH] strace: Check for mpers support
+
+strace enforces mpers support by default (in order to make aware of the
+possibility of incorrect non-native personality decoding early). On some
+architectures like Aarch64 this is not supported atm, so letting the configure
+script to check whether it is available to fix a build.
+
+Signed-off-by: Michal Hrusecky <michal.hrusecky@nic.cz>
+---
+ package/devel/strace/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/package/devel/strace/Makefile b/package/devel/strace/Makefile
+index 3507ffb..d3c3d14 100644
+--- a/package/devel/strace/Makefile
++++ b/package/devel/strace/Makefile
+@@ -55,7 +55,7 @@ config PACKAGE_strace_libunwind
+ 	default n
+ endef
+ 
+-CONFIGURE_ARGS += --with-libunwind=$(if $(CONFIG_PACKAGE_strace_libunwind),yes,no)
++CONFIGURE_ARGS += --enable-mpers=check --with-libunwind=$(if $(CONFIG_PACKAGE_strace_libunwind),yes,no)
+ MAKE_FLAGS := \
+ 	CCOPT="$(TARGET_CFLAGS)"
+ 
+-- 
+2.17.1
+