MSVC: Fix WinCE arch family preprocessor symbol (#14436)

In commit bd827f98 (Use COFF file header header for architecture
detection, 2013-08-05) the MSVC_<lang>_ARCHITECTURE_ID value computed by
CMakeDetermineCompilerId.cmake changed for WinCE architectures to be the
exact architecture read from the PE header.  Fix platform preprocessor
definitions in Modules/Platform/Windows-MSVC.cmake to correspond to the
architecture family (ARM or SHx) instead of the specific architecture.

Modules/Platform/Windows-MSVC.cmake

@@ -124,8 +124,15 @@ endif()
 set(CMAKE_BUILD_TYPE_INIT Debug)
 
 if(WINCE)
-  string(TOUPPER "${MSVC_C_ARCHITECTURE_ID}" _MSVC_C_ARCHITECTURE_ID_UPPER)
-  string(TOUPPER "${MSVC_CXX_ARCHITECTURE_ID}" _MSVC_CXX_ARCHITECTURE_ID_UPPER)
+  foreach(lang C CXX)
+    set(_MSVC_${lang}_ARCHITECTURE_FAMILY "${MSVC_${lang}_ARCHITECTURE_ID}")
+    if(_MSVC_${lang}_ARCHITECTURE_FAMILY STREQUAL "THUMB")
+      set(_MSVC_${lang}_ARCHITECTURE_FAMILY "ARM")
+    elseif(_MSVC_${lang}_ARCHITECTURE_FAMILY MATCHES "^SH")
+      set(_MSVC_${lang}_ARCHITECTURE_FAMILY "SHx")
+    endif()
+    string(TOUPPER "${_MSVC_${lang}_ARCHITECTURE_FAMILY}" _MSVC_${lang}_ARCHITECTURE_FAMILY_UPPER)
+  endforeach()
 
   if("${CMAKE_SYSTEM_VERSION}" MATCHES "^([0-9]+)\\.([0-9]+)")
     math(EXPR _CE_VERSION "${CMAKE_MATCH_1}*100 + ${CMAKE_MATCH_2}")
@@ -136,8 +143,8 @@ if(WINCE)
   endif()
 
   set(_PLATFORM_DEFINES "/D_WIN32_WCE=0x${_CE_VERSION} /DUNDER_CE")
-  set(_PLATFORM_DEFINES_C " /D${MSVC_C_ARCHITECTURE_ID} /D_${_MSVC_C_ARCHITECTURE_ID_UPPER}_")
-  set(_PLATFORM_DEFINES_CXX " /D${MSVC_CXX_ARCHITECTURE_ID} /D_${_MSVC_CXX_ARCHITECTURE_ID_UPPER}_")
+  set(_PLATFORM_DEFINES_C " /D${_MSVC_C_ARCHITECTURE_FAMILY} /D_${_MSVC_C_ARCHITECTURE_FAMILY_UPPER}_")
+  set(_PLATFORM_DEFINES_CXX " /D${_MSVC_CXX_ARCHITECTURE_FAMILY} /D_${_MSVC_CXX_ARCHITECTURE_FAMILY_UPPER}_")
 
   set(_RTC1 "")
   set(_FLAGS_CXX " /GR /EHsc")