mail/cyrus-imapd24: fix issue related to own assert() definition.

The C standard says assert() must be a void expression, so change
the definition from being a block to an expression, loosely patterned
after our <assert.h> header.  This makes it compatible with the
various perl headers this program uses.  Also, add a missing semicolon
in a sequence of assert() uses, as this error was now exposed.

Bump PKGREVISION.

(he)