Add missing #include <string.h>

git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@91 185d5e19-27fe-0310-9dcf-9bff6b9f3609

lib/openpam_log.c

@@ -31,13 +31,14 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $P4: //depot/projects/openpam/lib/openpam_log.c#9 $
+ * $P4: //depot/projects/openpam/lib/openpam_log.c#10 $
  */
 
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <syslog.h>
 
 #include <security/pam_appl.h>