Intel: Remove incorrect C++98 standard compiler flag on Windows

The change in commit 05e05cd2 (Intel: Fix compiler C++98 standard flag
on Windows, 2016-10-26) was wrong.  The Intel C++ Compiler for Windows
does not support either `-Qstd=c++98` or `-Qstd=gnu++98`.  Simply remove
both flags for this compiler and use no options at all to achieve this
mode.

Issue: #16384

Modules/Compiler/Intel-CXX.cmake

@@ -35,11 +35,12 @@ endif()
 
 if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.1)
   if("x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
-    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "${_std}=gnu++98")
+    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
+    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
   else()
     set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "${_std}=c++98")
+    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "${_std}=gnu++98")
   endif()
-  set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "${_std}=${_ext}98")
 endif()
 
 if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.1)
@@ -67,13 +68,13 @@ macro(cmake_record_cxx_compile_features)
   if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC" AND
       NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.1)
     if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 15.0)
-      _get_intel_features(${CMAKE_CXX14_STANDARD_COMPILE_OPTION} CMAKE_CXX14_COMPILE_FEATURES)
+      _get_intel_features("${CMAKE_CXX14_STANDARD_COMPILE_OPTION}" CMAKE_CXX14_COMPILE_FEATURES)
     endif()
     if (_result EQUAL 0)
-      _get_intel_features(${CMAKE_CXX11_STANDARD_COMPILE_OPTION} CMAKE_CXX11_COMPILE_FEATURES)
+      _get_intel_features("${CMAKE_CXX11_STANDARD_COMPILE_OPTION}" CMAKE_CXX11_COMPILE_FEATURES)
     endif()
     if (_result EQUAL 0)
-      _get_intel_features(${CMAKE_CXX98_STANDARD_COMPILE_OPTION} CMAKE_CXX98_COMPILE_FEATURES)
+      _get_intel_features("${CMAKE_CXX98_STANDARD_COMPILE_OPTION}" CMAKE_CXX98_COMPILE_FEATURES)
     endif()
   endif()
 endmacro()