instead or additionally to string.h, in preparation for functions move. * moves str[n]casecmp() functions and others to strings.h. * strings.h doesn't include string.h anymore. * this solves #10949
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1070 a95241bf-73f2-0310-859d-f6bbb57e9c96