Add micro version number to --version output

Some projects, such as qtwebengine, parse the output of --version,
and are tripped up by a version string with only two components.

samu.c

@@ -133,7 +133,7 @@ main(int argc, char *argv[])
 	case '-':
 		arg = EARGF(usage());
 		if (strcmp(arg, "version") == 0) {
-			printf("%d.%d\n", ninjamajor, ninjaminor);
+			printf("%d.%d.0\n", ninjamajor, ninjaminor);
 			return 0;
 		} else if (strcmp(arg, "verbose") == 0) {
 			buildopts.verbose = true;