This port generates some headers based on MySQL headers, and a couple
of the variables must have been deprecated because the resulting
variable name ended in "__UNUSED". Double underscores are not allowed
in Ada, so the build broke.
Since the Ada header is generated during the configure phase, I'm adding
a post-configure target to replace "__" with "_" to restore the build.
Since the dependencies change from MySQL 5.5 to MySQL 5.6, revbump.
b8c4451936