[libc++] NFC: Remove the %{compile} substitution, which is not used anymore

libcxx/utils/libcxx/test/config.py

@@ -1008,8 +1008,6 @@ class Configuration(object):
         sub.append(('%{link_libcxxabi}', pipes.quote(self.cxx.link_libcxxabi_flag)))
         if self.cxx.isVerifySupported():
             sub.append(('%{verify}', ' '.join(self.cxx.verify_flags)))
-        # Add compile and build shortcuts
-        sub.append(('%{compile}', '%{cxx} -o %t.o %s -c %{flags} %{compile_flags}'))
         sub.append(('%{build}',   '%{cxx} -o %t.exe %s %{flags} %{compile_flags} %{link_flags}'))
         if self.cxx.use_modules:
             sub.append(('%{build_module}', '%{build}'))