mongrel2: add upstream patch to fix symbol conflict

The symbol 'max_align_t', defined in the mongrel2 sources
(src/mem/align.h), is also defined in one of the standard headers in
some toolchains (the ones based on GCC 5+ apparently).

This conflict has been solved upstream, and a new version (1.10.0)
containing the fix has been released already, so this backported patch
may be dropped in the future when mongrel2 gets a version bump.

Fixes:

  http://autobuild.buildroot.net/results/b7f/b7f86bdda094de96633e9921e0e5895eadc89217/
  http://autobuild.buildroot.net/results/f62/f623703aa6d7992b67d305331734e4ed0c7b2be4/
  http://autobuild.buildroot.net/results/eb3/eb385cb4f87078122028e85cbe31caa01d794991/
  ...

Signed-off-by: Rodrigo Rebello <rprebello@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/mongrel2/0004-Rename-symbol-to-prevent-conflict.patch

@@ -0,0 +1,45 @@
+From 8d0bc79f38913b1a55e7d151b32bbc9462c24b47 Mon Sep 17 00:00:00 2001
+From: Jason Miller <jason@jasom.org>
+Date: Fri, 14 Aug 2015 19:03:09 -0700
+Subject: [PATCH] Rename symbol to prevent conflict
+
+One of the standard headers defines max_align_t on some versions of linux.
+
+[Backported from upstream commit
+https://github.com/mongrel2/mongrel2/commit/563bac8c59b9b32205164d237cf1ec0cb48d189f.]
+
+Signed-off-by: Rodrigo Rebello <rprebello@gmail.com>
+---
+ src/mem/align.h  | 2 +-
+ src/mem/halloc.c | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/mem/align.h b/src/mem/align.h
+index 4c6e183..03a4999 100644
+--- a/src/mem/align.h
++++ b/src/mem/align.h
+@@ -30,7 +30,7 @@ union max_align
+ 	void (*q)(void);
+ };
+ 
+-typedef union max_align max_align_t;
++typedef union max_align h_max_align_t;
+ 
+ #endif
+ 
+diff --git a/src/mem/halloc.c b/src/mem/halloc.c
+index b097d1f..40d0c09 100644
+--- a/src/mem/halloc.c
++++ b/src/mem/halloc.c
+@@ -34,7 +34,7 @@ typedef struct hblock
+ #endif
+ 	hlist_item_t  siblings; /* 2 pointers */
+ 	hlist_head_t  children; /* 1 pointer  */
+-	max_align_t   data[1];  /* not allocated, see below */
++	h_max_align_t   data[1];  /* not allocated, see below */
+ 	
+ } hblock_t;
+ 
+-- 
+2.1.4
+