Log Message:
Some clean up realted to net/libnet{10,11}.
* buildlink bin/libnet{10,11}-config to bin/libnet-config for comvenience
  (they ware renamed in pkgsrc to avoid conflict)
* remove -lnet from BUILDLINK_CPPFLAGS.libnet11.
  linker flags should not be in CPPFLAGS, and it berak likage with libtool
  as reported in PR 37300.
* libnet11 install just a static library, so set defaut DEPMETHOD = build

Bump PKGREVISION for libnet11 related packages (net/isic will be updated later).