raw1394: include stdlib.h for strtol()

Fixes compiler warning when compiling with xml stuff in core disabled.

ext/raw1394/gstdv1394src.c

@@ -42,6 +42,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <libavc1394/avc1394.h>
 #include <libavc1394/avc1394_vcr.h>

ext/raw1394/gsthdv1394src.c

@@ -41,6 +41,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <libavc1394/avc1394.h>
 #include <libavc1394/avc1394_vcr.h>