avoid conflict with clang's header version.

www/mongrel2/patches/patch-src_mem_align_h

@@ -0,0 +1,35 @@
+$OpenBSD: patch-src_mem_align_h,v 1.1 2017/05/13 08:53:52 espie Exp $
+
+Index: src/mem/align.h
+--- src/mem/align.h.orig
++++ src/mem/align.h
+@@ -15,22 +15,13 @@
+ #ifndef _LIBP_ALIGN_H_
+ #define _LIBP_ALIGN_H_
+ 
+-/*
+- *	a type with the most strict alignment requirements
+- */
+-union max_align
+-{
+-	char   c;
+-	short  s;
+-	long   l;
+-	int    i;
+-	float  f;
+-	double d;
+-	void * v;
+-	void (*q)(void);
+-};
+-
+-typedef union max_align max_align_t;
++#ifndef __CLANG_MAX_ALIGN_T_DEFINED
++#define __CLANG_MAX_ALIGN_T_DEFINED
++typedef struct {
++	long long __max_align_ll __aligned(__alignof__(long long));
++	long double __max_align_ld __aligned(__alignof__(long double));
++} max_align_t;
++#endif
+ 
+ #endif
+