Fix compiler warnings and add -Werror back in when --enable-tests is

Fix compiler warnings and add -Werror back in when --enable-tests is

	* configure.in:
	* gp11/gp11.h:
	* gp11/reference/Makefile.am:
	* gp11/tests/gp11-test-module.c:
	* gp11/tests/unit-test-gp11-attributes.c:
	* pam/tests/unit-test-pam-setup.c:
	* pkcs11/gck/gck-file-store.c:
	* pkcs11/gck/gck-file-tracker.c:
	* pkcs11/gck/gck-manager.c:
	* pkcs11/gck/gck-session.c:
	* pkcs11/roots/gck-roots-certificate.c:
	* pkcs11/rpc-layer/gck-rpc-module.c:
	* pkcs11/ssh-agent/gck-ssh-agent-ops.c:
	* pkcs11/ssh-store/gck-ssh-public-key.c: Fix compiler warnings
	and add -Werror back in when --enable-tests is configured.

svn path=/trunk/; revision=1442