make: fix GCC warnings

@@ -28,11 +28,11 @@
 
 #include <stdio.h>
 
 extern FILE     *get_report_file(void);
 extern char     *get_target_being_reported_for(void);
-extern void     report_dependency(register char *name);
+extern void     report_dependency(const char *name);
 extern int      file_lock(char *name, char *lockname, int *file_locked, int timeout);
 #ifdef NSE
 extern char     *setenv(char *name, char *value);
 #endif