pam: Update to version 1.6.1

pam: Update to version 1.6.1

- Update from version 1.6.0 to 1.6.1
- Update of rootfile
- Removal of patch for as changes now incorporated in source tarball.
- Changelog
    1.6.1
	build: fail if specified configure options cannot be satisfied.
	pam_env: fixed --disable-econf --enable-vendordir support.
	pam_unix: do not warn if password aging is disabled.
	pam_unix: try to set uid to 0 before unix_chkpwd invocation.
	pam_unix: allow empty passwords with non-empty hashes.
	Multiple minor bug fixes, build fixes, portability fixes,
	 documentation improvements, and translation updates.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>