The installation of the header files was modified slightly
to correspond with the GNUstep makefile package. All OpenStep
headers go into Foundation while the gnustep-base specific
headers go into gnustep/base.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@2437 72102866-910b-0410-8b05-ffd578937521