libwebp: mips build fixes

third_party/libwebp/dsp/cpu.c

 // Copyright 2011 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // CPU detection
@@ skipping 100 matching lines @@
 }
 VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
 #elif defined(WEBP_USE_NEON)
 // define a dummy function to enable turning off NEON at runtime by setting
 // VP8DecGetCPUInfo = NULL
 static int armCPUInfo(CPUFeature feature) {
   (void)feature;
   return 1;
 }
 VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
-#elif defined(__mips__)
+#elif defined(WEBP_USE_MIPS32)
 static int mipsCPUInfo(CPUFeature feature) {
   (void)feature;
   return 1;
 }
 VP8CPUInfo VP8GetCPUInfo = mipsCPUInfo;
 #else
 VP8CPUInfo VP8GetCPUInfo = NULL;
 #endif