cmake: Mark Windows builds as WIN32_EXECUTABLE.

Otherwise you'll get a console window when you start the .exe

Author: icculus

CMakeLists.txt

@@ -188,6 +188,9 @@ if(DIRKSIMPLE_SDL)
         set_target_properties(dirksimple PROPERTIES LINK_FLAGS "${IPO_FLAG} -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s ASSERTIONS=0 -s EXPORTED_RUNTIME_METHODS=['addRunDependency','removeRunDependency'] -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=['$autoResumeAudioContext','$dynCall']")
     endif()
 
+    # This is safe to set on all platforms. Otherwise your SDL app will have a terminal window pop up with it on Windows.
+    set_property(TARGET dirksimple PROPERTY WIN32_EXECUTABLE TRUE)
+
     if(NOT DIRKSIMPLE_FORCE_BASE_DIR STREQUAL "")
         set_target_properties(dirksimple PROPERTIES COMPILE_DEFINITIONS "DIRKSIMPLE_FORCE_BASE_DIR=${DIRKSIMPLE_FORCE_BASE_DIR}")
     endif()