Fix as.exe crash on Windows

Code previously used to convert command-line arguments from wide
encoding to UTF-8 we used when `as.exe` was built with MinGW, is no
longer necessary.  It was causing the app to crash on Windows.

Author: grendello

src/gas/gas.hh

@@ -167,8 +167,6 @@ namespace xamarin::android::gas
 		~Gas ()
 		{}
 
-		void get_command_line (int &argc, char **&argv);
-
 		int run (int argc, char **argv);
 
 		const std::string& program_name () const noexcept
@@ -217,5 +215,4 @@ namespace xamarin::android::gas
 	};
 }
 
-extern xamarin::android::gas::Gas app;
 #endif // __GAS_HH

src/gas/gas.posix.cc

@@ -6,10 +6,6 @@
 
 using namespace xamarin::android::gas;
 
-void Gas::get_command_line ([[maybe_unused]] int &argc, [[maybe_unused]] char **&argv)
-{
-}
-
 void Gas::determine_program_dir ([[maybe_unused]] int argc, char **argv)
 {
 	fs::path program_path { argv[0] };

src/gas/gas.windows.cc

@@ -13,20 +13,6 @@
 
 using namespace xamarin::android::gas;
 
-void Gas::get_command_line (int &argc, char **&argv)
-{
-	LPWSTR *argvw = CommandLineToArgvW (GetCommandLineW (), &argc);
-	argv = new char*[argc + 1];
-
-	for (int i = 0; i < argc; i++) {
-		int size = WideCharToMultiByte (CP_UTF8, 0, argvw [i], -1, NULL, 0, NULL, NULL);
-		argv [i] = new char [size];
-		WideCharToMultiByte (CP_UTF8, 0, argvw [i], -1, argv [i], size, NULL, NULL);
-	}
-
-	argv [argc] = NULL;
-}
-
 void Gas::determine_program_dir ([[maybe_unused]] int argc, [[maybe_unused]] char **argv)
 {
 	TCHAR buffer[MAX_PATH + 1]{};

src/gas/main.cc

@@ -1,12 +1,9 @@
 // SPDX-License-Identifier: MIT
 #include "gas.hh"
 
-xamarin::android::gas::Gas app;
-
 int main (int argc, char **argv)
 {
-	// On windows this obtains the utf8 version of args
-	app.get_command_line (argc, argv);
+	xamarin::android::gas::Gas app;
 	// TODO: handle exceptions here (use backward for stacktrace perhaps?)
 	return app.run (argc, argv);
 }