[Dovecot] Using -module flag on sieve libs

[Dimitri]

Some modern distros (Mageia, Mandriva) use -no-undefined as a default
linker flag for building software. However, undefined symbols are OK if
the binary being linked is a plugin. To detect plugins, build system
looks for presence of "-module" libtool flag in makefiles.

There are two libraries in Pigeonhole that couldn't be linked with
-no-undefined:

src/lib-sieve/plugins/mailbox/libsieve_ext_mailbox.la
src/lib-sieve/libdovecot-sieve.la

These modules do contain undefined symbols, but they are not linked
against library that provides them. It would be good if corresponding
makefiles contained "-module" flags, so that build system could
selectively turn off that -no-undefined linker flag. Please see proposed
patch (attached).

Thanks,
Dimitri
Mageia Linux packager

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