musl: sys/socket.h: fix SO_PEERSEC value on MIPS

Differing from all other archs supported by musl, MIPS defines SO_PEERSEC
to 30 instead of 31.

Patch has also been submitted upstream.

Reported-by: Andrey Jr. Mlenikov <[email protected]>
Signed-off-by: Matthias Schiffer <[email protected]>

toolchain/musl/patches/010-sys-socket.h-fix-SO_PEERSEC-value-on-MIPS.patch

@@ -0,0 +1,59 @@
+From 4e0877a604bad684be020f68e96a05156131fd44 Mon Sep 17 00:00:00 2001
+From: Matthias Schiffer <[email protected]>
+Date: Sun, 24 Jun 2018 17:05:31 +0200
+Subject: [PATCH] sys/socket.h: fix SO_PEERSEC value on MIPS
+
+Differing from all other archs supported by musl, MIPS defines SO_PEERSEC
+to 30 instead of 31.
+
+Reported-by: Andrey Jr. Mlenikov <[email protected]>
+---
+ arch/mips/bits/socket.h    | 2 ++
+ arch/mips64/bits/socket.h  | 2 ++
+ arch/mipsn32/bits/socket.h | 2 ++
+ include/sys/socket.h       | 3 +++
+ 4 files changed, 9 insertions(+)
+
+--- a/arch/mips/bits/socket.h
++++ b/arch/mips/bits/socket.h
+@@ -48,5 +48,7 @@ struct cmsghdr {
+ #define SO_SNDBUFFORCE  31
+ #define SO_RCVBUFFORCE  33
+ 
++#define SO_PEERSEC      30
++
+ #define SOCK_NONBLOCK     0200
+ #define SOCK_CLOEXEC  02000000
+--- a/arch/mips64/bits/socket.h
++++ b/arch/mips64/bits/socket.h
+@@ -64,5 +64,7 @@ struct cmsghdr {
+ #define SO_SNDBUFFORCE  31
+ #define SO_RCVBUFFORCE  33
+ 
++#define SO_PEERSEC      30
++
+ #define SOCK_NONBLOCK     0200
+ #define SOCK_CLOEXEC  02000000
+--- a/arch/mipsn32/bits/socket.h
++++ b/arch/mipsn32/bits/socket.h
+@@ -48,5 +48,7 @@ struct cmsghdr {
+ #define SO_SNDBUFFORCE  31
+ #define SO_RCVBUFFORCE  33
+ 
++#define SO_PEERSEC      30
++
+ #define SOCK_NONBLOCK     0200
+ #define SOCK_CLOEXEC  02000000
+--- a/include/sys/socket.h
++++ b/include/sys/socket.h
+@@ -201,7 +201,10 @@ struct linger {
+ #define SO_TIMESTAMP            29
+ #define SCM_TIMESTAMP           SO_TIMESTAMP
+ 
++#ifndef SO_PEERSEC
+ #define SO_PEERSEC              31
++#endif
++
+ #define SO_PASSSEC              34
+ #define SO_TIMESTAMPNS          35
+ #define SCM_TIMESTAMPNS         SO_TIMESTAMPNS