Avoid creating new processes to remove directories which we know are empty, which speeds things up a lot on windows

src/Composer/Downloader/ArchiveDownloader.php

@@ -137,7 +137,7 @@ abstract class ArchiveDownloader extends FileDownloader
             };
 
             $renameAsOne = false;
-            if (!file_exists($path) || ($filesystem->isDirEmpty($path) && $filesystem->removeDirectory($path))) {
+            if (!file_exists($path) || ($filesystem->isDirEmpty($path) && $filesystem->removeDirectoryPhp($path))) {
                 $renameAsOne = true;
             }
 

src/Composer/Downloader/FileDownloader.php

@@ -306,7 +306,7 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
 
         foreach ($dirsToCleanUp as $dir) {
             if (is_dir($dir) && $this->filesystem->isDirEmpty($dir) && realpath($dir) !== getcwd()) {
-                $this->filesystem->removeDirectory($dir);
+                $this->filesystem->removeDirectoryPhp($dir);
             }
         }
 

src/Composer/Util/Filesystem.php

@@ -188,7 +188,7 @@ class Filesystem
             throw new \RuntimeException('Aborting an attempted deletion of '.$directory.', this was probably not intended, if it is a real use case please report it.');
         }
 
-        if (1||!\function_exists('proc_open')) {
+        if (!\function_exists('proc_open')) {
             return $this->removeDirectoryPhp($directory);
         }