* autogen.sh: Fix for Solaris 10. o Replace `test -e` by `test -d` (directory) and `-h` (symlink), because pre-POSIX /bin/sh of Solaris 10 does not support `test -e`. o Replace the combination of `head` and `sed ...` by single sed command `sed -n 1...p`. GNU libtoolize with Solaris 10 /bin/sh complains "Broken Pipe" for the closure of stdout by `head`. Let `sed` receive all stdout and discard.