fix ranlib staled stamp issue

Author: bobzhang

scripts/install.js

@@ -24,7 +24,7 @@ if (supported_os.indexOf(process.platform) < 0) {
 }
 var is_windows = process.platform === "win32";
 
-process.env.BS_RELEASE_BUILD = "true";
+
 
 var ninja_bin_output = path.join(root_dir, process.platform, "ninja.exe");
 
@@ -38,6 +38,7 @@ function provideNinja() {
   var ninja_source_dir = path.join(root_dir, "vendor", "ninja");
   function build_ninja() {
     console.log(`building ninja`);
+    ensureExists(ninja_source_dir);
     cp.execSync(`tar xzvf ../ninja.tar.gz`, {
       cwd: ninja_source_dir,
       stdio: [0, 1, 2]

scripts/ninja.js

@@ -1613,7 +1613,7 @@ rule gcc
     command = $ocamlopt -ccopt -fPIC -ccopt -O2 -ccopt -o -ccopt $out -c $in
 build stubs/ext_basic_hash_stubs.o : gcc  stubs/ext_basic_hash_stubs.c
 rule ocamlmklib
-    command = $ocamlmklib $in -o $name
+    command = $ocamlmklib -v $in -o $name && touch $out
 
 rule mk_keywords
     command = $ocaml $in