Sync with upstream

VERSION

@@ -1,4 +1,4 @@
-CCACHE_VERSION=4.6
+CCACHE_VERSION=4.8.3
 
 # WebRTC doesn't have its own versioning, so we use Chromium versions:
 # https://chromiumdash.appspot.com/releases

build.windows.ps1

@@ -24,7 +24,7 @@ function Exec
 
 # VERSIONファイル読み込み
 $lines = get-content VERSION
-foreach($line in $lines){
+foreach ($line in $lines) {
   # WEBRTC_COMMITの行のみ取得する
   if ($line -match "^WEBRTC_") {
     $name, $value = $line.split("=",2)