Drop @DEFS@ from the build system

This will only ever be set to -DHAVE_CONFIG_H. However, we shouldn't give this
flag to other people's code (e.g. through znc-config). Since we don't need it,
it's best to just drop it completely.

Signed-off-by: Uli Schlachter <psychon@znc.in>
admin: Fix getchan {inconfig,keepbuffer,detached}

Instead of giving a useful result, they returned their result by sometimes
omitting the first character of the option name. Whoops.

Signed-off-by: Uli Schlachter <psychon@znc.in>
TODO

Signed-off-by: Uli Schlachter <psychon@znc.in>