ocamlPackages.luv: clean up autotool file patching

Files named configure are already patched automatically:
97c43828fb. We only need to worry about
ltmain.sh now.

Since we no longer have to worry about the missing substitution in
configure, we can use --replace-fail instead of --replace which avoids
the deprecation warning.

pkgs/development/ocaml-modules/luv/default.nix

@@ -26,9 +26,7 @@ let
       patches = lib.optional (lib.versionOlder version "0.5.14") ./incompatible-pointer-type-fix.diff;
 
       postConfigure = ''
-        for f in src/c/vendor/configure/{ltmain.sh,configure}; do
-          substituteInPlace "$f" --replace /usr/bin/file file
-        done
+        substituteInPlace "src/c/vendor/configure/ltmain.sh" --replace-fail /usr/bin/file file
       '';
 
       nativeBuildInputs = [ file ];