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

third_party/getopt/getopt.cc

Index: third_party/getopt/getopt.cc
diff --git a/third_party/getopt/getopt.c b/third_party/getopt/getopt.cc
similarity index 99%
rename from third_party/getopt/getopt.c
rename to third_party/getopt/getopt.cc
index d63492f17f01eb7cd90b3b18f7b48360445e1a6d..1f6eaffdb842111d3bc709e476e3421c01322790 100644
--- a/third_party/getopt/getopt.c
+++ b/third_party/getopt/getopt.cc
@@ -99,6 +99,8 @@ gpietsch@comcast.net
 #include "getopt.h"
 #endif
 
+namespace crashpad {
+
 /* macros */
 
 /* types */
@@ -415,4 +417,6 @@ getopt_long_only (int argc, char **argv, const char *shortopts,
   return getopt_internal (argc, argv, (char*)shortopts, (GETOPT_LONG_OPTION_T*)longopts, longind, 1);
 }
 
+}  // namespace crashpad
+
 /* end of file GETOPT.C */