Fix compile error

  CCLD     vlc
/home/br/br3/output/build/vlc-2.2.1/src/.libs/libvlccore.so: undefined reference to `strerror_l'

Code for #else condition was taken from
http://patches.osdyson.org/patch/series/view/vlc/2.2.0~rc2-1+dyson2/dyson.patch

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

diff -uNr vlc-2.2.1.org/configure.ac vlc-2.2.1/configure.ac
--- vlc-2.2.1.org/configure.ac	2015-04-13 09:57:54.000000000 +0200
+++ vlc-2.2.1/configure.ac	2015-05-02 16:13:22.800448380 +0200
@@ -534,7 +534,7 @@
 
 dnl Check for usual libc functions
 AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
-AC_CHECK_FUNCS([daemon fcntl fstatvfs fork getenv getpwuid_r isatty lstat memalign mmap open_memstream openat pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale])
+AC_CHECK_FUNCS([daemon fcntl fstatvfs fork getenv getpwuid_r isatty lstat memalign mmap open_memstream openat pread posix_fadvise posix_madvise setlocale strerror_l stricmp strnicmp strptime uselocale])
 AC_REPLACE_FUNCS([atof atoll dirfd fdopendir flockfile fsync getdelim getpid gmtime_r lldiv localtime_r nrand48 poll posix_memalign rewind setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strsep strtof strtok_r strtoll swab tdestroy strverscmp])
 AC_CHECK_FUNCS(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
diff -uNr vlc-2.2.1.org/src/posix/error.c vlc-2.2.1/src/posix/error.c
--- vlc-2.2.1.org/src/posix/error.c	2014-08-14 09:20:04.000000000 +0200
+++ vlc-2.2.1/src/posix/error.c	2015-05-02 16:25:24.075378369 +0200
@@ -31,6 +31,7 @@
 
 static const char *vlc_strerror_l(int errnum, const char *lname)
 {
+#ifdef HAVE_STRERROR_L
     int saved_errno = errno;
     locale_t loc = newlocale(LC_MESSAGES_MASK, lname, (locale_t)0);
 
@@ -51,6 +52,9 @@
     const char *buf = strerror_l(errnum, loc);
 
     freelocale(loc);
+#else
+    const char *buf = strerror(errnum);
+#endif
     return buf;
 }