configure: supply target_arch define to gyp.js

Since version 1.1.1 gyp.js uses environment files. Set --target_arch
command-line option with value of node-gyp --arch option in order to
generate proper ninja environment file.

Removed findMSVS() function and `vcvars.bat` invocation before building with
`ninja` because `gyp.js` supports target environments and the actual
`target_arch` is set before on `configure` stage.

lib/build.js

@@ -36,7 +36,6 @@ function build (gyp, argv, callback) {
     , config
     , arch
     , nodeDir
-    , vcDir
 
   if (gyp.opts.gypjs) {
     command = gyp.opts.ninja || process.env.NINJA || 'ninja'
@@ -75,41 +74,14 @@ function build (gyp, argv, callback) {
       log.verbose('architecture', arch)
       log.verbose('node dev dir', nodeDir)
 
-      if (win) {
-        gyp.opts.gypjs? findMSVS() : findSolutionFile()
+      if (!gyp.opts.gypjs && win) {
+        findSolutionFile()
       } else {
         doWhich()
       }
     })
   }
 
-  /**
-   * On Windows, find Visual C++ toolset
-   */
-
-  function findMSVS () {
-    var msvs_version = gyp.opts.msvs_version || 'auto'
-    var vs_versions = (msvs_version === 'auto'? [14, 12, 10] : [msvs_version])
-    vs_versions.find(function(version) {
-      var vscomntools = process.env['VS' + version + '0COMNTOOLS']
-      if (vscomntools) {
-        // remove quotes to work with path.join()
-        if (vscomntools.substr(0, 1) === '"' && vscomntools.substr(-1, 1) === '"') {
-          vscomntools = vscomntools.substr(1, vscomntools.length - 2)
-        }
-        vcDir = path.join(vscomntools, '..', '..', 'VC')
-        if (vcDir) {
-          log.verbose('found Visual C++ in ', vcDir)
-          return true
-        }
-      }
-    })
-    if (!vcDir) {
-      callback(new Error('Visual C++ not found, please setup a C++ compiler toolset'))
-    }
-    doWhich()
-  }
-
   /**
    * On Windows, find the first build/*.sln file.
    */
@@ -281,11 +253,6 @@ function build (gyp, argv, callback) {
           argv.push('-j' + j)
         }
       }
-      // invoke vcvarsall.bat before build
-      if (win && vcDir) {
-        argv.unshift(arch === 'ia32'? 'x86' : arch, '&', command)
-        command = path.join(vcDir, 'vcvarsall.bat')
-      }
     }
 
     var proc = gyp.spawn(command, argv)