builtins: windows has only one flavour on ARM

Windows on ARM is a hard-float only environment.  Don't try to build two copies
of the same library.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@277834 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
index 34d9298..4f3976d 100644
--- a/cmake/base-config-ix.cmake
+++ b/cmake/base-config-ix.cmake
@@ -153,8 +153,12 @@
       test_target_arch(mips "" "-mips32r2" "--target=mips-linux-gnu")
       test_target_arch(mips64 "" "-mips64r2" "--target=mips64-linux-gnu" "-mabi=64")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "arm")
-      test_target_arch(arm "" "-march=armv7-a" "-mfloat-abi=soft")
-      test_target_arch(armhf "" "-march=armv7-a" "-mfloat-abi=hard")
+      if(WIN32)
+        test_target_arch(arm "" "" "")
+      else()
+        test_target_arch(arm "" "-march=armv7-a" "-mfloat-abi=soft")
+        test_target_arch(armhf "" "-march=armv7-a" "-mfloat-abi=hard")
+      endif()
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "aarch32")
       test_target_arch(aarch32 "" "-march=armv8-a")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "aarch64")