Allow build configuration to run on Windows machines (#9951)

tasks/config/build.js

@@ -1,11 +1,19 @@
 import { execSync as exec } from 'child_process';
+const platform = require('os').platform();
 
 export default (grunt) => {
   const pkgVersion = grunt.config.get('pkg.version');
 
   const sha = String(exec('git rev-parse HEAD')).trim();
-  const number = parseFloat(String(exec('git log --format="%h" | wc -l')).trim());
   const version = buildVersion(grunt.option('release'), pkgVersion);
+  let number;
+
+  if (/^win/.test(platform)) {
+    // Windows does not have the wc process and `find /C /V ""` does not consistently work
+    number = String(exec('git log --format="%h"')).split('\n').length;
+  } else {
+    number = parseFloat(String(exec('git log --format="%h" | wc -l')).trim());
+  }
 
   return { sha, number, version };
 };