Properly define the __NR_memfd_create macro for MIPS

This is an upstream patch which has been applied to the master branch
and I have adapted it to make it apply to the v216 version.

Upstream commit:
  http://cgit.freedesktop.org/systemd/systemd/commit/?id=e6c019026b8cfd27a997e6e6ed1349f8f289b7e2

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

From cdd25569e583ccfff3aef0eda175a2d07c00f859 Mon Sep 17 00:00:00 2001
From: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Date: Tue, 4 Nov 2014 10:49:58 +0000
Subject: [PATCH] Properly define the __NR_memfd_create macro for MIPS

This macro exists for MIPS since v3.17:
  https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=42944521af97a3b25516f15f3149aec3779656dc

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
---
 src/shared/missing.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/src/shared/missing.h b/src/shared/missing.h
index 3ff1a21..6888163 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -152,6 +152,9 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
 #    ifndef __NR_fanotify_mark
 #      define __NR_fanotify_mark 4337
 #    endif
+#    ifndef __NR_memfd_create
+#      define __NR_memfd_create 4354
+#    endif
 #  elif _MIPS_SIM == _MIPS_SIM_NABI32
 #    ifndef __NR_fanotify_init
 #      define __NR_fanotify_init 6300
@@ -159,6 +162,9 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
 #    ifndef __NR_fanotify_mark
 #      define __NR_fanotify_mark 6301
 #    endif
+#    ifndef __NR_memfd_create
+#      define __NR_memfd_create 6318
+#    endif
 #  elif _MIPS_SIM == _MIPS_SIM_ABI64
 #    ifndef __NR_fanotify_init
 #      define __NR_fanotify_init 5295
@@ -166,6 +172,9 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
 #    ifndef __NR_fanotify_mark
 #      define __NR_fanotify_mark 5296
 #    endif
+#    ifndef __NR_memfd_create
+#      define __NR_memfd_create 5314
+#    endif
 #  endif
 #else
 #  ifndef __NR_fanotify_init
-- 
1.7.1