community/gpgme: ship static libraries

Adds the "--enable-static" flag to the APKBUILD to build gpgme's static libs. This mirrors the behaviour that exists in Debian's gpgme-dev package.

This change would be useful for us as we're trying to statically link an application using buildah, which has a hard requirement on gpgme. As this package does not build the static libraries, it's not currently possible to do this with Alpine, but it is possible with Debian.