Do not generate documentation for .d files; they do not contain source code.

Originally committed as revision 24122 to svn://svn.ffmpeg.org/ffmpeg/trunk

Doxyfile

@@ -577,7 +577,7 @@ EXCLUDE_SYMLINKS       = NO
 # against the file with absolute path, so to exclude all test directories
 # for example use the pattern */test/*
 
-EXCLUDE_PATTERNS       = *.svn *.git
+EXCLUDE_PATTERNS       = *.svn *.git *.d
 
 # The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
 # (namespaces, classes, functions, etc.) that should be excluded from the