Revert "configure: use "path-array" for PYTHONPATH"

This reverts commit ff88e5f.

Of the 5.5MB footprint of node-gyp, path-array makes up 3.6MB.

Removing this reduces the weight of npm (and thus node) appreciably.

PR-URL: #990
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

lib/configure.js

@@ -14,7 +14,6 @@ var fs = require('graceful-fs')
   , semver = require('semver')
   , mkdirp = require('mkdirp')
   , cp = require('child_process')
-  , PathArray = require('path-array')
   , extend = require('util')._extend
   , processRelease = require('./process-release')
   , spawn = cp.spawn
@@ -288,8 +287,9 @@ function configure (gyp, argv, callback) {
       argv.unshift(gyp_script)
 
       // make sure python uses files that came with this particular node package
-      var pypath = new PathArray(process.env, 'PYTHONPATH')
-      pypath.unshift(path.join(__dirname, '..', 'gyp', 'pylib'))
+      var pypath = process.env.PYTHONPATH ? [process.env.PYTHONPATH] : []
+      pypath.unshift(path.resolve(__dirname, '..', 'gyp', 'pylib'))
+      process.env.PYTHONPATH = pypath.join(process.platform === 'win32' ? ';' : ':')
 
       var cp = gyp.spawn(python, argv)
       cp.on('exit', onCpExit)