Add KMime
* Makefile.am (EXTRA_DIST): Add patches. * configure.ac: Add KMime. * packages/packages.current: Add KMime. * patches/kmime/0001-Check-for-and-replace-strcasestr.patch, patches/kmime/0002-Fix-Windows-build.patch: New. * src/Makefile.am, src/config.nsi.in: Update accordingly. * src/inst-sections.nsi: Update and fix duplicated kcodecs entry. * src/inst-kmime.nsi, src/uninst-kmime.nsi: New.
Patches were neccessary for Windows build and are already submitted
to upstream for review / inclusion.