- remove subpackages, it makes no sense to have -docs fetching its distfile
from a separate tarball. If really needed one can make a standalone port.
- remove handmade nspr.pc.in, upstream provides one
- remove handrolled install target and use the one upstream provides.
- merge PFRAG.shared back into PLIST
Tested on amd64/i386/powerpc and in a bulk build.
Needed by firefox 18.
ok sthen@ ajacoutot@ jasper@