[packages] mdadm: add missing functions posix_memalign() and canonicalize_file_name() to work with backfire/uClibc 0.9.30

git-svn-id: svn://svn.openwrt.org/openwrt/packages@27581 3c298f89-4303-0410-b956-a3cf2f4a3e73

utils/mdadm/patches/200-uclibc_0.9.30_compat.patch

@@ -0,0 +1,42 @@
+Index: mdadm-3.2/mdadm.h
+===================================================================
+--- mdadm-3.2.orig/mdadm.h	2011-02-01 06:06:21.000000000 +0100
++++ mdadm-3.2/mdadm.h	2011-07-11 00:36:52.135848368 +0200
+@@ -33,6 +33,37 @@
+ # endif
+ #endif
+ 
++#ifdef UCLIBC
++# include <features.h>
++# if __UCLIBC_MINOR__ <= 9 && __UCLIBC_SUBLEVEL__ <= 30
++
++#include <errno.h>
++void *memalign(size_t blocksize, size_t bytes);
++static inline int posix_memalign(void **memptr, size_t alignment, size_t size)
++{
++	if (alignment % sizeof(void *) != 0)
++		return EINVAL;
++
++	*memptr = memalign(alignment, size);
++	return (*memptr != NULL ? 0 : ENOMEM);
++}
++
++#include <limits.h>
++char *strdup(const char *s);
++char *realpath(const char *path, char *resolved_path);
++static inline char *canonicalize_file_name(const char *path)
++{
++	char resolved[PATH_MAX] = { 0 };
++
++	if (!realpath(path, resolved))
++		return NULL;
++
++	return strdup(resolved);
++}
++
++# endif /* __UCLIBC_MINOR__ <= 9 && __UCLIBC_SUBLEVEL__ <= 30 */
++#endif /* UCLIBC */
++
+ #include	<sys/types.h>
+ #include	<sys/stat.h>
+ #include	<stdlib.h>