CMake: drop needless x${VAR} tricks

CMakeLists.txt

@@ -121,8 +121,8 @@ if(KWSYS_CXX_STANDARD)
   set(CMAKE_CXX_STANDARD "${KWSYS_CXX_STANDARD}")
 elseif(NOT DEFINED CMAKE_CXX_STANDARD AND NOT DEFINED KWSYS_CXX_STANDARD)
   if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
-     AND "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC"
-     AND "x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU"
+     AND CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC"
+     AND CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "GNU"
     )
     set(CMAKE_CXX_STANDARD 14)
   else()
@@ -1013,7 +1013,7 @@ ADD_DEFINITIONS("-DKWSYS_NAMESPACE=${KWSYS_NAMESPACE}")
 
 # Disable deprecation warnings for standard C functions.
 IF(MSVC OR (WIN32 AND (CMAKE_C_COMPILER_ID STREQUAL "Intel" OR
-   (CMAKE_C_COMPILER_ID STREQUAL "Clang"  AND "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC"))))
+   (CMAKE_C_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC"))))
   ADD_DEFINITIONS(
     -D_CRT_NONSTDC_NO_DEPRECATE
     -D_CRT_SECURE_NO_DEPRECATE
@@ -1104,7 +1104,7 @@ IF(KWSYS_STANDALONE OR CMake_SOURCE_DIR)
       SET(KWSYS_CXX_TESTS ${KWSYS_CXX_TESTS}
         testConsoleBuf.cxx
         )
-      IF("x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xMSVC" AND
+      IF(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND
          CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "19.0.23506")
         set_property(SOURCE testConsoleBuf.cxx testConsoleBufChild.cxx PROPERTY COMPILE_FLAGS /utf-8)
       ENDIF()