Make old doxygen versions able to find eina example files.

The only two available versions of doxygen for e2(debian sid), where
online docs are generated, are borked. The newest version(1.8.1.1) is
extremely borked so best to just use the old one(1.7.1.1-2) which
doesn't properly parse EXAMPLE_PATTERNS.

SVN revision: 73357

legacy/eina/doc/Doxyfile.in

@@ -666,7 +666,7 @@ EXAMPLE_PATH           = @top_srcdir@/src/examples
 # and *.h) to filter out the source-files in the directories. If left
 # blank all files are included.
 
-EXAMPLE_PATTERNS       = *.c,*.h,*.x
+EXAMPLE_PATTERNS       =
 
 # If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be
 # searched for input files to be used with the \include or \dontinclude