lib: find python checks order changed on windows

These changes favor py launcher over other checks excluding command line
or npm configuration and environment variable checks.

Also, updated supported python versions list.

Fixes: nodejs#2871

lib/find-python.js

@@ -15,7 +15,7 @@ const programFiles = process.env.ProgramW6432 || process.env.ProgramFiles || `${
 const programFilesX86 = process.env['ProgramFiles(x86)'] || `${programFiles} (x86)`
 
 const winDefaultLocationsArray = []
-for (const majorMinor of ['39', '38', '37', '36']) {
+for (const majorMinor of ['311', '310', '39', '38']) {
   if (foundLocalAppData) {
     winDefaultLocationsArray.push(
       `${localAppData}\\Programs\\Python\\Python${majorMinor}\\python.exe`,
@@ -114,7 +114,20 @@ PythonFinder.prototype = {
           },
           check: this.checkCommand,
           arg: this.env.PYTHON
-        },
+        }
+      ]
+
+      if (this.win) {
+        checks.push({
+          before: () => {
+            this.addLog(
+              'checking if the py launcher can be used to find Python 3')
+          },
+          check: this.checkPyLauncher
+        })
+      }
+
+      checks.push(...[
         {
           before: () => { this.addLog('checking if "python3" can be used') },
           check: this.checkCommand,
@@ -125,7 +138,7 @@ PythonFinder.prototype = {
           check: this.checkCommand,
           arg: 'python'
         }
-      ]
+      ])
 
       if (this.win) {
         for (var i = 0; i < this.winDefaultLocations.length; ++i) {
@@ -139,13 +152,6 @@ PythonFinder.prototype = {
             arg: location
           })
         }
-        checks.push({
-          before: () => {
-            this.addLog(
-              'checking if the py launcher can be used to find Python 3')
-          },
-          check: this.checkPyLauncher
-        })
       }
 
       return checks