[CMake] Update cache file for Win to ARM cross tooolchain. NFC.

Removed passing CMAKE_AR from the library configurations.

(cherry picked from commit 19c1b08)

Author: vvereschaka

clang/cmake/caches/CrossWinToARMLinux.cmake

@@ -42,9 +42,6 @@ if (NOT DEFINED DEFAULT_SYSROOT)
   message(WARNING "DEFAULT_SYSROOT must be specified for the cross toolchain build.")
 endif()
 
-if (DEFINED LLVM_AR)
-  set(CMAKE_AR "${LLVM_AR}" CACHE STRING "")
-endif()
 if (NOT DEFINED LLVM_TARGETS_TO_BUILD)
   set(LLVM_TARGETS_TO_BUILD "ARM" CACHE STRING "")
 endif()
@@ -111,7 +108,6 @@ set(LLVM_BUILTIN_TARGETS                    "${TARGET_TRIPLE}" CACHE STRING "")
 
 set(BUILTINS_${TARGET_TRIPLE}_CMAKE_SYSTEM_NAME                         "Linux" CACHE STRING "")
 set(BUILTINS_${TARGET_TRIPLE}_CMAKE_SYSROOT                             "${DEFAULT_SYSROOT}"  CACHE STRING "")
-set(BUILTINS_${TARGET_TRIPLE}_CMAKE_AR                                  "${CMAKE_AR}"  CACHE STRING "")
 set(BUILTINS_${TARGET_TRIPLE}_CMAKE_INSTALL_RPATH                       "${RUNTIMES_INSTALL_RPATH}"  CACHE STRING "")
 set(BUILTINS_${TARGET_TRIPLE}_CMAKE_BUILD_WITH_INSTALL_RPATH            ON  CACHE BOOL "")
 
@@ -122,7 +118,6 @@ set(RUNTIMES_${TARGET_TRIPLE}_LLVM_ENABLE_RUNTIMES                      "${LLVM_
 
 set(RUNTIMES_${TARGET_TRIPLE}_CMAKE_SYSTEM_NAME                         "Linux" CACHE STRING "")
 set(RUNTIMES_${TARGET_TRIPLE}_CMAKE_SYSROOT                             "${DEFAULT_SYSROOT}"  CACHE STRING "")
-set(RUNTIMES_${TARGET_TRIPLE}_CMAKE_AR                                  "${CMAKE_AR}"  CACHE STRING "")
 set(RUNTIMES_${TARGET_TRIPLE}_CMAKE_INSTALL_RPATH                       "${RUNTIMES_INSTALL_RPATH}"  CACHE STRING "")
 set(RUNTIMES_${TARGET_TRIPLE}_CMAKE_BUILD_WITH_INSTALL_RPATH            ON  CACHE BOOL "")