CompilerId: Drop MSVC conditions from ObjC and ObjC++

MSVC does not compile these languages.

Modules/CMakeOBJCCompilerId.m.in

diff --git a/Modules/CMakeOBJCCompilerId.m.in b/Modules/CMakeOBJCCompilerId.m.in
index 89bfe02..eff4f39 100644
--- a/Modules/CMakeOBJCCompilerId.m.in
+++ b/Modules/CMakeOBJCCompilerId.m.in
@@ -21,8 +21,7 @@
 @CMAKE_OBJC_COMPILER_ID_ERROR_FOR_TEST@
 
 #if !defined(__STDC__)
-# if (defined(_MSC_VER) && !defined(__clang__)) \
-  || (defined(__ibmxl__) || defined(__IBMC__))
+# if defined(__ibmxl__) || defined(__IBMC__)
 #  define C_VERSION "90"
 # else
 #  define C_VERSION

Modules/CMakeOBJCXXCompilerId.mm.in

diff --git a/Modules/CMakeOBJCXXCompilerId.mm.in b/Modules/CMakeOBJCXXCompilerId.mm.in
index 242b77f..23c25c5 100644
--- a/Modules/CMakeOBJCXXCompilerId.mm.in
+++ b/Modules/CMakeOBJCXXCompilerId.mm.in
@@ -23,11 +23,7 @@
 @CMAKE_OBJCXX_COMPILER_ID_PLATFORM_CONTENT@
 @CMAKE_OBJCXX_COMPILER_ID_ERROR_FOR_TEST@
 
-#if defined(_MSC_VER) && defined(_MSVC_LANG)
-#define CXX_STD _MSVC_LANG
-#else
 #define CXX_STD __cplusplus
-#endif
 
 const char* info_language_standard_default = "INFO" ":" "standard_default["
 #if CXX_STD > 202002L