Ninja: don't define MSVC_IDE when using the ninja generator

Thanks to Oscar Fuentes

Modules/Platform/Windows-cl.cmake

@@ -37,7 +37,7 @@ SET(CMAKE_COMPILE_RESOURCE "rc <FLAGS> /fo<OBJECT> <SOURCE>")
 # that is automatically copied into try_compile directories
 # by the global generator.
 SET(MSVC_IDE 1)
-IF(CMAKE_GENERATOR MATCHES "Makefiles")
+IF(CMAKE_GENERATOR MATCHES "Makefiles" OR CMAKE_GENERATOR MATCHES "Ninja")
   SET(MSVC_IDE 0)
   IF(NOT CMAKE_VC_COMPILER_TESTS_RUN)
     SET(CMAKE_VC_COMPILER_TESTS 1)
@@ -125,7 +125,7 @@ IF(CMAKE_GENERATOR MATCHES "Makefiles")
     ENDIF(CMAKE_COMPILER_RETURN)
     MAKE_DIRECTORY("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp3")
   ENDIF(NOT CMAKE_VC_COMPILER_TESTS_RUN)
-ENDIF(CMAKE_GENERATOR MATCHES "Makefiles")
+ENDIF(CMAKE_GENERATOR MATCHES "Makefiles" OR CMAKE_GENERATOR MATCHES "Ninja")
 
 IF(MSVC_C_ARCHITECTURE_ID MATCHES 64)
   SET(CMAKE_CL_64 1)