Fix error with add_custom_command

Author: Ravbug

CMakeLists.txt

@@ -66,8 +66,8 @@ set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT "
 # Strip binary for release builds
 if (CMAKE_BUILD_TYPE STREQUAL Release)
 	if(LINUX)
-		add_custom_command(TARGET ${APPNAME} POST_BUILD COMMAND ${CMAKE_STRIP} ${CMAKE_BUILD_TYPE}/${PROJECT_NAME})
+		add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_STRIP} ${CMAKE_BUILD_TYPE}/${PROJECT_NAME})
 	elseif(APPLE)
-		add_custom_command(TARGET ${APPNAME} POST_BUILD COMMAND ${CMAKE_STRIP} ${CMAKE_BUILD_TYPE}/${PROJECT_NAME}.app/Contents/MacOS/${PROJECT_NAME})
+		add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_STRIP} ${CMAKE_BUILD_TYPE}/${PROJECT_NAME}.app/Contents/MacOS/${PROJECT_NAME})
 	endif()
 endif ()