Bring back the build of static libraries. That will allow
other ports using glib20 to build static binaries or libs. For
example devel/qemu-user-static.

Discussed at: #bsdports


git-svn-id: svn://creme-brulee.marcuscom.com/ports/trunk@19784 df743ca5-7f9a-e211-a948-0013205c9059