allow chained proxy-binary php-inclusions (#10823)

* allow chained proxy-binary php-inclusion by skipping redundant “phpvfscomposer” stream-wrapper registration

Author: brandung-sjorek

src/Composer/Installer/BinaryInstaller.php

@@ -379,7 +379,10 @@ public function url_stat(\$path, \$flags)
         }
     }
 
-    if (function_exists('stream_wrapper_register') && stream_wrapper_register('phpvfscomposer', 'Composer\BinProxyWrapper')) {
+    if (
+        (function_exists('stream_get_wrappers') && in_array('phpvfscomposer', stream_get_wrappers(), true))
+        || (function_exists('stream_wrapper_register') && stream_wrapper_register('phpvfscomposer', 'Composer\BinProxyWrapper'))
+    ) {
         include("phpvfscomposer://" . $binPathExported);
         exit(0);
     }