build failed with g++ v. 4.4.5

err msg: frameworks/base/media/libstagefright/MediaExtractor.cpp:62: error: invalid conversion from ‘const char*’ to ‘char*’
strrchr provides two prototypes. the one used returns const char* instead of char*

Change-Id: I6442ee642aebfbfc2f977bab40016cfedc7789ac

media/libstagefright/MediaExtractor.cpp

@@ -59,7 +59,7 @@ sp<MediaExtractor> MediaExtractor::Create(
     }
 
     if (!strncmp(mime, "drm", 3)) {
-        char *originalMime = strrchr(mime, '+') + 1;
+        const char *originalMime = strrchr(mime, '+') + 1;
 
         if (!strncmp(mime, "drm+es_based", 12)) {
             return new DRMExtractor(source, originalMime);