Add long options

include/extern/getopt.h

@@ -1,11 +1,31 @@
+/*
+ * Copyright © 2005-2019 Rich Felker, et al.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* This implementation was taken from musl and modified for RGBDS */
+
 #ifndef _GETOPT_H
 #define _GETOPT_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-int getopt(int, char * const [], const char *);
 extern char *optarg;
 extern int optind, opterr, optopt, optreset;
 
@@ -16,15 +36,10 @@ struct option {
 	int val;
 };
 
-int getopt_long(int, char *const *, const char *, const struct option *, int *);
 int getopt_long_only(int, char *const *, const char *, const struct option *, int *);
 
 #define no_argument        0
 #define required_argument  1
 #define optional_argument  2
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif