Fix the temp-objc_runtime_visible.swift to work with when building swift against a non-default toolchain

Author: kubamracek

test/Interpreter/objc_runtime_visible.swift

@@ -1,6 +1,6 @@
 // RUN: %empty-directory(%t)
 
-// RUN: %clang %target-cc-options -isysroot %sdk -fobjc-arc %S/Inputs/objc_runtime_visible.m -fmodules -nodefaultlibs -lc -dynamiclib -o %t/libobjc_runtime_visible.dylib -install_name @executable_path/libobjc_runtime_visible.dylib
+// RUN: %target-clang %target-cc-options -isysroot %sdk -fobjc-arc %S/Inputs/objc_runtime_visible.m -fmodules -nodefaultlibs -lc -dynamiclib -o %t/libobjc_runtime_visible.dylib -install_name @executable_path/libobjc_runtime_visible.dylib
 // RUN: %target-codesign %t/libobjc_runtime_visible.dylib
 // RUN: nm -g %t/libobjc_runtime_visible.dylib | %FileCheck %s
 // RUN: %target-build-swift -import-objc-header %S/Inputs/objc_runtime_visible.h %t/libobjc_runtime_visible.dylib %s -o %t/main