MAIN: Add a small WinMain/wWinMain on Windows

Just using main(), especially when building with -municode, doesn't
seem to work with Qt.

Normally, the Qt way would be to link against qtmain, but that doesn't
work with -municode either.

Instead, we're doing it ourselves, then.

CMakeLists.txt

@@ -65,7 +65,7 @@ elseif(CMAKE_HOST_WIN32)
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /NODEFAULTLIB:libcmt.lib")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
   else()
-    add_compile_options(-municode)
+    add_compile_options(-mwindows -municode)
   endif()
 else()
   message(STATUS "Unknown platform, maybe not supported")

configure.ac

@@ -228,7 +228,7 @@ case "$target" in
 		AM_CONDITIONAL(WIN32, false)
 		;;
 	*mingw*)
-		PHAETHON_CFLAGS="-mconsole -municode"
+		PHAETHON_CFLAGS="-mwindows -municode"
 		PHAETHON_LIBS=""
 		AM_CONDITIONAL(WIN32, true)
 		;;

src/phaethon.cpp

@@ -22,6 +22,12 @@
  *  The project's main entry point.
  */
 
+#include "src/common/platform.h"
+
+#ifdef WIN32
+	#include <windows.h>
+#endif
+
 #include <cstdio>
 
 #include <QApplication>
@@ -31,7 +37,6 @@
 #include "src/common/util.h"
 #include "src/common/error.h"
 #include "src/common/ustring.h"
-#include "src/common/platform.h"
 
 #include "src/gui/mainwindow.h"
 
@@ -154,3 +159,15 @@ void Phaethon::deinitSubsystems() {
 void openGamePath(const Common::UString &path) {
 	Phaethon phaethon(path);
 }
+
+#ifdef WIN32
+#ifdef UNICODE
+	int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow) {
+		return main(0, 0);
+	}
+#else
+	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR pCmdLine, int nCmdShow) {
+		return main(0, 0);
+	}
+#endif
+#endif