[nostalgia,olympic] Fix pack tool build for Windows

src/olympic/applib/applib.cpp

@@ -50,7 +50,7 @@ void registerKeelModules() noexcept;
 void registerStudioModules() noexcept;
 }
 
-#ifdef _WIN32
+#if defined(_WIN32) && OLYMPIC_GUI_APP
 int WinMain() {
 	auto const argc = __argc;
 	auto const argv = const_cast<const char**>(__argv);

src/olympic/studio/applib/src/CMakeLists.txt

@@ -12,6 +12,7 @@ add_library(
 )
 target_compile_definitions(
 	StudioAppLib PUBLIC
+		OLYMPIC_GUI_APP=1
 		OLYMPIC_LOAD_STUDIO_MODULES=1
 		OLYMPIC_APP_NAME="Studio"
 )