configure: try pkg-config for curses Static linkikng against ncurses may require explicit -ltinfo. In case -lcurses and -lncurses both didn't work give pkg-config a chance. Fixes #1094786 for me. Signed-off-by: Vadim Evard <v.e.evard@gmail.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>