Remove hardcoded paths to moc.exe, rcc.exe, uic.exe from CMakeLists.txt

CMakeLists.txt

@@ -1,19 +1,22 @@
 project(Endorphin)
 cmake_minimum_required(VERSION 3.12)
 
-set(QT_MOC_EXECUTABLE "C:/qt/5.5/msvc2013/bin/moc.exe")
-add_executable(Qt5::moc IMPORTED)
-set_target_properties(Qt5::moc PROPERTIES IMPORTED_LOCATION ${QT_MOC_EXECUTABLE})
+if(DEFINED QT_MOC_EXECUTABLE)
+	add_executable(Qt5::moc IMPORTED)
+	set_target_properties(Qt5::moc PROPERTIES IMPORTED_LOCATION ${QT_MOC_EXECUTABLE})
+endif()
 set(CMAKE_AUTOMOC ON)
 
-set(QT_RCC_EXECUTABLE "C:/qt/5.5/msvc2013/bin/rcc.exe")
-add_executable(Qt5::rcc IMPORTED)
-set_target_properties(Qt5::rcc PROPERTIES IMPORTED_LOCATION ${QT_RCC_EXECUTABLE})
+if(DEFINED QT_RCC_EXECUTABLE)
+	add_executable(Qt5::rcc IMPORTED)
+	set_target_properties(Qt5::rcc PROPERTIES IMPORTED_LOCATION ${QT_RCC_EXECUTABLE})
+endif()
 set(CMAKE_AUTORCC ON)
 
-set(QT_UIC_EXECUTABLE "C:/qt/5.5/msvc2013/bin/uic.exe")
-add_executable(Qt5::uic IMPORTED)
-set_target_properties(Qt5::uic PROPERTIES IMPORTED_LOCATION ${QT_UIC_EXECUTABLE})
+if(DEFINED QT_UIC_EXECUTABLE)
+	add_executable(Qt5::uic IMPORTED)
+	set_target_properties(Qt5::uic PROPERTIES IMPORTED_LOCATION ${QT_UIC_EXECUTABLE})
+endif()
 set(CMAKE_AUTOUIC ON)
 
 set(CMAKE_BUILD_TYPE Release)