Replace all gflag implementations with cvar implementations

src/xenia/base/main_posix.cc

@@ -7,10 +7,9 @@
  ******************************************************************************
  */
 
+#include "xenia/base/cvar.h"
 #include "xenia/base/main.h"
 
-#include <gflags/gflags.h>
-
 #include "xenia/base/logging.h"
 #include "xenia/base/string.h"
 
@@ -23,10 +22,7 @@ bool has_console_attached() { return true; }
 extern "C" int main(int argc, char** argv) {
   auto entry_info = xe::GetEntryInfo();
 
-  google::SetUsageMessage(std::string("usage: ") +
-                          xe::to_string(entry_info.usage));
-  google::SetVersionString("1.0");
-  google::ParseCommandLineFlags(&argc, &argv, true);
+  cvar::ParseLaunchArguments(argc, argv);
 
   std::vector<std::wstring> args;
   for (int n = 0; n < argc; n++) {
@@ -39,6 +35,5 @@ extern "C" int main(int argc, char** argv) {
   // Call app-provided entry point.
   int result = entry_info.entry_point(args);
 
-  google::ShutDownCommandLineFlags();
   return result;
 }