build: Use llvm-ranlib from the toolchain when building the wasm stdlib

llvm-ranlib is now installed in the toolchain, so we can use it instead of
the one in the build directory.

swiftlang#72212

Author: kateinoigakukun

utils/swift_build_support/swift_build_support/products/wasmstdlib.py

@@ -50,9 +50,8 @@ def build(self, host_target):
         # object files.
         self.cmake_options.define('CMAKE_AR:STRING', os.path.join(
             toolchain_path, 'bin', 'llvm-ar'))
-        # llvm-ranlib is not installed in the final toolchain, so use one in build dir
         self.cmake_options.define('CMAKE_RANLIB:STRING', os.path.join(
-            self._host_swift_build_dir(host_target), 'bin', 'llvm-ranlib'))
+            toolchain_path, 'bin', 'llvm-ranlib'))
         self.cmake_options.define(
             'SWIFT_NATIVE_CLANG_TOOLS_PATH:STRING', os.path.join(toolchain_path, 'bin'))
         self.cmake_options.define(