[wasm][build] Skip wasi-libc symbol check step to support LLVM 17

Author: kateinoigakukun

utils/swift_build_support/swift_build_support/products/wasisysroot.py

@@ -51,6 +51,12 @@ def build(self, host_target):
         shell.call([
             'make', 'install',
             '-j', str(build_jobs),
+            # FIXME: wasi-libc's pre-defined macro list does not expect
+            # `__FPCLASS_XXX`, which is introduced by the LLVM 17, yet.
+            # So skip the symbol check step by treating the phony target
+            # as very old file.
+            # https://github.com/llvm/llvm-project/commit/7dd387d2971d7759cadfffeb2082439f6c7ddd49
+            '--old-file=check-symbols',
             '-C', self.source_dir,
             'OBJDIR=' + os.path.join(self.build_dir, 'obj'),
             'SYSROOT=' + WASILibc.sysroot_build_path(build_root, host_target),