Drop build date from generated file

for reproducible builds.

Without this, dagcheck.c in the debugsource package
varies across builds.

code/tools/lcc/lburg/lburg.c

@@ -458,7 +458,7 @@ static void emitdefs(Nonterm nts, int ntnumber) {
 static void emitheader(void) {
 	time_t timer = time(NULL);
 
-	print("/*\ngenerated at %sby %s\n*/\n", ctime(&timer), rcsid);
+	print("/*\ngenerated by %s\n*/\n", rcsid);
 	print("static void %Pkids(NODEPTR_TYPE, int, NODEPTR_TYPE[]);\n");
 	print("static void %Plabel(NODEPTR_TYPE);\n");
 	print("static int %Prule(void*, int);\n\n");