gcc5: Upgrade to gcc 5.4

Drop patches which has been applied to gcc5 branch
until 5.4 release

(From OE-Core rev: 42487843f846ae61f8bd1b2278d148ff37f0d667)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-5.4/0009-c99-snprintf.patch

@@ -0,0 +1,28 @@
+From fde97f80d2d931ed3fa4a86294799366b2359331 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 29 Mar 2013 08:49:03 +0400
+Subject: [PATCH 09/46] c99-snprintf
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Upstream-Status: Pending
+---
+ libstdc++-v3/include/c_std/cstdio | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libstdc++-v3/include/c_std/cstdio b/libstdc++-v3/include/c_std/cstdio
+index 37f01ca..f00c06d 100644
+--- a/libstdc++-v3/include/c_std/cstdio
++++ b/libstdc++-v3/include/c_std/cstdio
+@@ -144,7 +144,7 @@ namespace std
+   using ::vsprintf;
+ } // namespace std
+ 
+-#if _GLIBCXX_USE_C99
++#if _GLIBCXX_USE_C99 || defined(__UCLIBC__)
+ 
+ #undef snprintf
+ #undef vfscanf
+-- 
+2.6.3
+