Fix checkPlatform takes an insane amount of time to complete when use…

…d in a loop

lib/current-env.js

@@ -13,12 +13,8 @@ function cpu () {
   return process.arch
 }
 
-function libc (osName) {
-  // this is to make it faster on non linux machines
-  if (osName !== 'linux') {
-    return undefined
-  }
-  let family
+let family
+if (os() === 'linux') {
   const originalExclude = process.report.excludeNetwork
   process.report.excludeNetwork = true
   const report = process.report.getReport()
@@ -28,6 +24,11 @@ function libc (osName) {
   } else if (Array.isArray(report.sharedObjects) && report.sharedObjects.some(isMusl)) {
     family = 'musl'
   }
+}
+function libc (osName) {
+  if (osName !== 'linux') {
+    return undefined
+  }
   return family
 }