Fix bad macro call noticed by MSVC compiler.

Author: adunstan

src/test/regress/pg_regress.c

@@ -2142,7 +2142,7 @@ regression_main(int argc, char *argv[], init_function ifunc, test_function tfunc
 					 SYSTEMQUOTE "\"%s\" -C \"%s/%s\" DESTDIR=\"%s/install\" install >> \"%s/log/install.log\" 2>&1" SYSTEMQUOTE,
 					 makeprog, top_builddir, sl->str, temp_install, outputdir);
 #else
-			fprintf(stderr, _("\n%s: --extra-install option not supported on this platform\n", progname));
+			fprintf(stderr, _("\n%s: --extra-install option not supported on this platform\n"), progname);
 			exit_nicely(2);
 #endif