[cmake] Fix thinko.

Instead of overwriting all of the paths for the other build configurations with
the one that LLVM selected, I was resetting the path for LLVM's build
configuration over and over again. = /.

This fixes the issue.

Author: gottesmm

cmake/modules/SwiftXcodeSupport.cmake

@@ -64,7 +64,7 @@ function(fixup_imported_target_property_for_xcode target property real_build_typ
     if ("${c}" STREQUAL "${real_build_type}")
       continue()
     endif()
-    set_target_properties(${target} PROPERTIES ${FULL_PROP_NAME} "${PROP_VALUE}")
+    set_target_properties(${target} PROPERTIES "${property}_${c}" "${PROP_VALUE}")
   endforeach()
 endfunction()