Add a clang patch for adding support for __declspec(selectany)

patches/clang-0005.patch

@@ -0,0 +1,28 @@
+From c12d174fab12116ed74f3984d12fbff057943f60 Mon Sep 17 00:00:00 2001
+From: Martell Malone <martellmalone@gmail.com>
+Date: Mon, 15 Aug 2016 20:57:27 -0700
+Subject: [PATCH 5/5] mingw-w64: enable support for __declspec(selectany)
+
+---
+ include/clang/Basic/Attr.td | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/include/clang/Basic/Attr.td b/include/clang/Basic/Attr.td
+index 7da1efe..2d4be9e 100644
+--- a/include/clang/Basic/Attr.td
++++ b/include/clang/Basic/Attr.td
+@@ -2097,9 +2097,8 @@ def DLLImport : InheritableAttr, TargetSpecificAttr<TargetWindows> {
+   let Documentation = [DLLImportDocs];
+ }
+ 
+-def SelectAny : InheritableAttr {
+-  let Spellings = [Declspec<"selectany">];
+-  let LangOpts = [MicrosoftExt];
++def SelectAny : InheritableAttr, TargetSpecificAttr<TargetWindows> {
++  let Spellings = [Declspec<"selectany">, GCC<"selectany">];
+   let Documentation = [Undocumented];
+ }
+ 
+-- 
+2.7.4
+