doxygen: update doxygen project number to 6.5

doxygen number was laggin behind a bit.

doxygen/common.doxy

@@ -23,7 +23,7 @@ PROJECT_NAME           = Mesa
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 6.2
+PROJECT_NUMBER         = 6.5
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put.