add strerror_r symbol alias as some autotool based packages simply use AC_CHECK_LIB() to see if a function exists rather than checking the headers

libc/string/__xpg_strerror_r.c

@@ -5,11 +5,16 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
+/* Make sure we get proper strerror_r() prototype */
+#define strerror_r __moo
+
 #include <features.h>
 #include <errno.h>
 #include <string.h>
 #include "_syserrmsg.h"
 
+#undef strerror_r
+
 libc_hidden_proto(__xpg_strerror_r)
 libc_hidden_proto(memcpy)
 libc_hidden_proto(strlen)
@@ -271,3 +276,4 @@ int __xpg_strerror_r(int errnum, char *strerrbuf, size_t buflen)
 
 #endif /* __UCLIBC_HAS_ERRNO_MESSAGES__ */
 libc_hidden_def(__xpg_strerror_r)
+weak_alias(__xpg_strerror_r, strerror_r)