Refactor Windows defines with generator expression

src/libprojectM/CMakeLists.txt

@@ -1,19 +1,15 @@
 add_compile_definitions(
         DATADIR_PATH="${PROJECTM_DATADIR_PATH}"
         $<IF:$<PLATFORM_ID:Darwin>,GL_SILENCE_DEPRECATION,>
+        $<IF:$<PLATFORM_ID:Windows>,NOMINMAX,>
+        $<IF:$<PLATFORM_ID:Windows>,WIN32_LEAN_AND_MEAN,>
+        $<IF:$<PLATFORM_ID:Windows>,STBI_NO_DDS,>
 )
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     # dirent.h support
     set(MSVC_EXTRA_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/msvc")
     include_directories("${MSVC_EXTRA_INCLUDE_DIR}")
-
-    # Additional preprocessor definitions for Windows builds
-    add_compile_definitions(
-            NOMINMAX
-            WIN32_LEAN_AND_MEAN
-            STBI_NO_DDS
-    )
 endif()
 
 # List of targets used in export().