Make it optional to install native-messaging
* src/Makefile.am (EXTRA_DIST): Add inst-gpgme-browser.nsi * src/inst-gpgme-browser.nsi: New. * src/inst-sections.nsi, src/installer.nsi: Update accordingly. * src/uninst-gpgme.nsi: Remove the browser integration. * po: Auto update.
This is mostly in an extra inst file so that it can be
sorted when including.