Patch from Robert Millan.

Add patches from libtool CVS.
* libtool.m4: Add kfreebsd*-gnu and knetbsd*-gnu.
* ltconfig: Likewise.
* ltcf-c.sh: Likewise.
* ltcf-cxx.sh: Likewise.
* ltcf-gcj.sh: Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@81213 138bc75d-0d04-0410-961f-82ee72b054a4