Fix compilation of 45ESR with GCC 5.50

[dryeo]

Paul backported some SSE fixes to GCC 5.5.0. Attempting to compile results in one build break, snippet, this is repeated for other values.

C:/work/cc45esr/mozilla/toolkit/components/osfile/NativeOSFileInternals.cpp:161:5: error: 'EINVAL' was not declared in this scope"}]
[1544037380.742, "build_output", {"line": "     EINVAL, EINVAL, ENOENT, ENOENT, EMFILE,  /* 0..4 */"}]
[1544037380.742, "build_output", {"line": "     ^"}]
[1544037380.742, "build_output", {"line": "C:/work/cc45esr/mozilla/toolkit/components/osfile/NativeOSFileInternals.cpp:161:21: error: 'ENOENT' was not declared in this scope"}]
[1544037380.755, "build_output", {"line": "     EINVAL, EINVAL, ENOENT, ENOENT, EMFILE,  /* 0..4 */"}]
[1544037380.757, "build_output", {"line": "                     ^"}]

and a bunch of output about redefined macros, snippet,

 "In file included from <command-line>:0:0:"}]
[1544037381.96, "build_output", {"line": "./../../mozilla-config.h:153:0: warning: \"__STDC_LIMIT_MACROS\" redefined"}]
[1544037381.96, "build_output", {"line": " #define __STDC_LIMIT_MACROS"}]
[1544037381.962, "build_output", {"line": " ^"}]
[1544037381.962, "build_output", {"line": "<built-in>: note: this is the location of the previous definition"}]
[1544037381.962, "build_output", {"line": "In file included from <command-line>:0:0:"}]
[1544037381.962, "build_output", {"line": "./../../mozilla-config.h:154:0: warning: \"__STDC_CONSTANT_MACROS\" redefined"}]
[1544037382.332, "build_output", {"line": " #define __STDC_CONSTANT_MACROS"}]
[1544037382.332, "build_output", {"line": " ^"}]
[1544037382.332, "build_output", {"line": "<built-in>: note: this is the location of the previous definition"}]

I'll inline the 2 needed patches, be nice to get them applied.

From e8bdcad2dbae7d11e13c2a0b14d9566977eaf337 Mon Sep 17 00:00:00 2001
From: Dave Yeo <dave.r.yeo@gmail.com>
Date: Mon, 26 Nov 2018 14:54:58 -0800
Subject: [PATCH 1/2] Add some guards to make newer versions of GCC happy

Signed-off-by: Dave Yeo <dave.r.yeo@gmail.com>
---
 js/public/RequiredDefines.h | 6 ++++++
 mozilla-config.h.in         | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/js/public/RequiredDefines.h b/js/public/RequiredDefines.h
index 308fd7d625..242755e99b 100644
--- a/js/public/RequiredDefines.h
+++ b/js/public/RequiredDefines.h
@@ -24,9 +24,15 @@
  * and with __STDC_FORMAT_MACROS for the format macros (PRId32 for example) used
  * with the fprintf function family.
  */
+#if !defined (__STDC_LIMIT_MACROS)
 #define __STDC_LIMIT_MACROS
+#endif
+#if !defined (__STDC_CONSTANT_MACROS)
 #define __STDC_CONSTANT_MACROS
+#endif
+#if !defined(__STDC_FORMAT_MACROS)
 #define __STDC_FORMAT_MACROS
+#endif
 
 /* Also define a char16_t type if not provided by the compiler. */
 #include "mozilla/Char16.h"
diff --git a/mozilla-config.h.in b/mozilla-config.h.in
index 8d2c857a65..dc089b79a9 100644
--- a/mozilla-config.h.in
+++ b/mozilla-config.h.in
@@ -26,8 +26,12 @@
  * and with __STDC_FORMAT_MACROS for the format macros (PRId32 for example) used
  * with the fprintf function family.
  */
+#if !defined (__STDC_LIMIT_MACROS)
 #define __STDC_LIMIT_MACROS
+#endif
+#if !defined (__STDC_CONSTANT_MACROS)
 #define __STDC_CONSTANT_MACROS
+#endif
 #if !defined(__STDC_FORMAT_MACROS)
 #define __STDC_FORMAT_MACROS
 #endif
-- 
2.11.0

From aa926ab36eefc07a7b8a54dcf1bce69c240f343b Mon Sep 17 00:00:00 2001
From: Dave Yeo <dave.r.yeo@gmail.com>
Date: Wed, 5 Dec 2018 19:44:28 -0800
Subject: [PATCH 2/2] [OS/2]Add an include to make GCC 5.5.0 happy

Fixes a bunch of errors where things like EINVAL was not declared in this scope

Signed-off-by: Dave Yeo <dave.r.yeo@gmail.com>
---
 toolkit/components/osfile/NativeOSFileInternals.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/toolkit/components/osfile/NativeOSFileInternals.cpp b/toolkit/components/osfile/NativeOSFileInternals.cpp
index cbb58666aa..e555d467ae 100644
--- a/toolkit/components/osfile/NativeOSFileInternals.cpp
+++ b/toolkit/components/osfile/NativeOSFileInternals.cpp
@@ -49,6 +49,10 @@
 #include <windows.h>
 #endif // defined (XP_WIN)
 
+#if defined(XP_OS2)
+#include <errno.h>
+#endif
+
 namespace mozilla {
 
 MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE(ScopedPRFileDesc, PRFileDesc, PR_Close)
-- 
2.11.0