configure: test for newlocale() separate from uselocale()

As NetBSD only implements a barely sensical subset of the locale_t API.

(cherry picked from commit 192c77e42d)
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Conflicts:
	configure.ac

configure.ac

@@ -590,7 +590,7 @@ dnl Check for system libs needed
 need_libc=false
 
 dnl Check for usual libc functions
-AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatvfs fork getenv getpwuid_r isatty lstat memalign mkostemp mmap open_memstream openat pipe2 pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp strptime uselocale])
+AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatvfs fork getenv getpwuid_r isatty lstat memalign mkostemp mmap newlocale open_memstream openat pipe2 pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp strptime uselocale])
 AC_REPLACE_FUNCS([aligned_alloc atof atoll dirfd fdopendir ffsll flockfile fsync getdelim getpid lldiv memrchr nrand48 poll recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tdestroy tfind timegm timespec_get strverscmp pathconf])
 AC_REPLACE_FUNCS([gettimeofday])
 AC_CHECK_FUNC(fdatasync,,

include/vlc_fixups.h

@@ -320,16 +320,13 @@ void *aligned_alloc(size_t, size_t);
 
 /* locale.h */
 #ifndef HAVE_USELOCALE
-#define LC_ALL_MASK      0
-#define LC_NUMERIC_MASK  0
-#define LC_MESSAGES_MASK 0
-#define LC_GLOBAL_LOCALE ((locale_t)(uintptr_t)1)
+# ifndef HAVE_NEWLOCALE
+#  define LC_ALL_MASK      0
+#  define LC_NUMERIC_MASK  0
+#  define LC_MESSAGES_MASK 0
+#  define LC_GLOBAL_LOCALE ((locale_t)(uintptr_t)1)
 typedef void *locale_t;
-static inline locale_t uselocale(locale_t loc)
-{
-    (void)loc;
-    return NULL;
-}
+
 static inline void freelocale(locale_t loc)
 {
     (void)loc;
@@ -339,6 +336,15 @@ static inline locale_t newlocale(int mask, const char * locale, locale_t base)
     (void)mask; (void)locale; (void)base;
     return NULL;
 }
+# else
+#  include <locale.h>
+# endif
+
+static inline locale_t uselocale(locale_t loc)
+{
+    (void)loc;
+    return NULL;
+}
 #endif
 
 #if !defined (HAVE_STATIC_ASSERT) && !defined(__cpp_static_assert)