win: Compile getopt as C++ and wrap in crashpad namespace

third_party/getopt/getopt.h

 /*
 Copyright (C) 1997 Gregory Pietsch
 
 [These files] are hereby placed in the public domain without restrictions. Just
 give the author credit, don't claim you wrote it or prevent anyone else from
 using it.
 */
 
 #ifndef GETOPT_H
 #define GETOPT_H
 
 /* include files needed by this include file */
 
 /* macros defined by this include file */
 #define no_argument       0
 #define required_argument 1
 #define OPTIONAL_ARG      2
 
 /* types defined by this include file */
 
+namespace crashpad {
+
 /* GETOPT_LONG_OPTION_T: The type of long option */
 typedef struct GETOPT_LONG_OPTION_T
 {
   const char *name;             /* the name of the long option */
   int has_arg;                  /* one of the above macros */
   int *flag;                    /* determines if getopt_long() returns a
                                  * value for a long option; if it is
                                  * non-NULL, 0 is returned as a function
                                  * value and the value of val is stored in
                                  * the area pointed to by flag.  Otherwise,
                                  * val is returned. */
   int val;                      /* determines the value to return if flag is
                                  * NULL. */
 } GETOPT_LONG_OPTION_T;
 
 typedef GETOPT_LONG_OPTION_T option;
 
-#ifdef __cplusplus
-extern "C"
-{
-#endif
+/* externally-defined variables */
+extern char *optarg;
+extern int optind;
+extern int opterr;
+extern int optopt;
 
-  /* externally-defined variables */
-  extern char *optarg;
-  extern int optind;
-  extern int opterr;
-  extern int optopt;
+/* function prototypes */
+int getopt(int argc, char** argv, char* optstring);
+int getopt_long(int argc,
+                char** argv,
+                const char* shortopts,
+                const GETOPT_LONG_OPTION_T* longopts,
+                int* longind);
+int getopt_long_only(int argc,
+                     char** argv,
+                     const char* shortopts,
+                     const GETOPT_LONG_OPTION_T* longopts,
+                     int* longind);
 
-  /* function prototypes */
-  int getopt (int argc, char **argv, char *optstring);
-  int getopt_long (int argc, char **argv, const char *shortopts,
-                   const GETOPT_LONG_OPTION_T * longopts, int *longind);
-  int getopt_long_only (int argc, char **argv, const char *shortopts,
-                        const GETOPT_LONG_OPTION_T * longopts, int *longind);
-
-#ifdef __cplusplus
-};
-
-#endif
+}  // namespace crashpad
 
 #endif /* GETOPT_H */
 
 /* END OF FILE getopt.h */