Simplify hello_imgui_add_app win32 implementation

Before passing source list to add_executable function:

* HELLOIMGUI_WIN32_NO_CONSOLE: Prepending "WIN32" flag to the source
list

* HELLOIMGUI_WIN32_AUTO_WINMAIN: Appending HelloImGui_WinMain.cpp file
to the source list

hello_imgui_cmake/hello_imgui_add_app.cmake

@@ -52,30 +52,26 @@ function(hello_imgui_add_app)
     ")
 
     #############################################################################
-
-    # Add the target for the application
-    if (ANDROID)
-        add_library(${app_name} SHARED ${app_sources})
-    else()
-        add_executable(${app_name} ${app_sources})
-    endif()
-
     # If windows, and if the user wants to, we can make this an app without console
     # and provide a WinMain entry point
     if (WIN32)
         if (HELLOIMGUI_WIN32_NO_CONSOLE)
-            # Make this an app without console, and use HelloImGui_WinMain.cpp
-            if (MINGW)
-                target_link_options(${app_name} PRIVATE -Wl,--subsystem,windows)
-            else() # If MSVC
-                target_link_options(${app_name} PRIVATE /SUBSYSTEM:WINDOWS)
-            endif()
+            # Make this an app without console
+            list(PREPEND app_sources WIN32)
         endif()
         if (HELLOIMGUI_WIN32_AUTO_WINMAIN)
-            target_sources(${app_name} PRIVATE ${HELLOIMGUI_CMAKE_PATH}/HelloImGui_WinMain.cpp)
+            # Use HelloImGui_WinMain.cpp
+            list(APPEND app_sources ${HELLOIMGUI_CMAKE_PATH}/HelloImGui_WinMain.cpp)
         endif()
     endif()
 
+    # Add the target for the application
+    if (ANDROID)
+        add_library(${app_name} SHARED ${app_sources})
+    else()
+        add_executable(${app_name} ${app_sources})
+    endif()
+
     hello_imgui_prepare_app(${app_name} ${assets_location})
 endfunction()