Fixes for the undefined enum and stale file handle leftover when opening a ".tags" file.

[sneakin]

Two commits that fix:

• the undefined enum today's compilers do not like,
• and stale file handle leftover when opening a ".tags" file.

The latter can be tested by watching the /proc/$PID/fd directory before and after opening and closing a ".tags" file. Doing this thousands of times exhausts your session's file handles until now.