Back-port binutils patch: Don't define _FORTIFY_SOURCE on MinGW

ref. https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=5f23a08201ed01570b34f5cff99a95fc7b9e2fdb

> Don't define _FORTIFY_SOURCE on MinGW
>
> Recent MinGW versions require -lssp when using _FORTIFY_SOURCE, which
> gdb does (in common-defs.h)
> msys2/MINGW-packages#5868 (comment)

> To avoid all the complications with checking for -lssp and making sure it's
> linked statically, just don't define it.

Author: mcspr

patches/bin-002-fortify-source.patch

@@ -0,0 +1,19 @@
+diff --git a/gdb/common/common-defs.h b/gdb/common/common-defs.h
+index 88b05ef723c..214bca1ee17 100644
+--- a/gdb/common/common-defs.h
++++ b/gdb/common/common-defs.h
+@@ -66,9 +66,13 @@
+    plus this seems like a reasonable safety measure.  The check for
+    optimization is required because _FORTIFY_SOURCE only works when
+    optimization is enabled.  If _FORTIFY_SOURCE is already defined,
+-   then we don't do anything.  */
++   then we don't do anything.  Also, on MinGW, fortify requires
++   linking to -lssp, and to avoid the hassle of checking for
++   that and linking to it statically, we just don't define
++   _FORTIFY_SOURCE there.  */
+ 
+-#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ > 0
++#if (!defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 \
++     && !defined(__MINGW32__))
+ #define _FORTIFY_SOURCE 2
+ #endif