Log Message:
Update libksba to 0.9.4.

Changes since 0.9.1:
 * Support for Extended Key Usage.
 * ksba_cms_identify may no return a pseudo content type for pkcs#12
   files.
 * Cleaned up the DN label table.
 * Fixed a bug in creating CMS signed data.
 * Interface changes:
	ksba_reader_clear             NEW.
	ksba_cert_get_ext_key_usages  NEW.
	KSBA_CT_PKCS12                NEW.