COMP: wmdep.l: added include file

wmake/src/wmkdep.l

@@ -46,6 +46,7 @@ Usage
 #include <string.h>
 #include <sys/types.h>
 #include <dirent.h>
+#include <errno.h>
 
 void nextFile(const char* fileName);
 void importFile(const char* fileName);