bug workaround

Originally committed as revision 1656 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Doxyfile

@@ -835,7 +835,7 @@ INCLUDE_FILE_PATTERNS  =
 # or name=definition (no spaces). If the definition and the = are 
 # omitted =1 is assumed.
 
-PREDEFINED             = 
+PREDEFINED             = __attribute__(x)=""
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then 
 # this tag can be used to specify a list of macro names that should be expanded.