added variable on library load on linux

Author: abner

lib/quickjs/ffi.dart

@@ -121,9 +121,11 @@ final DynamicLibrary _qjsLib = Platform.environment['FLUTTER_TEST'] == 'true'
             : DynamicLibrary.open('test/build/libffiquickjs.so'))
     : (Platform.isWindows
         ? DynamicLibrary.open('quickjs_c_bridge.dll')
-        : Platform.isAndroid
-            ? DynamicLibrary.open('libfastdev_quickjs_runtime.so')
-            : DynamicLibrary.process());
+        : (Platform.isLinux
+          ? DynamicLibrary.open(Platform.environment['LIBQUICKJSC_PATH'] ?? 'libquickjs_c_bridge_plugin.so')
+          : (Platform.isAndroid
+              ? DynamicLibrary.open('libfastdev_quickjs_runtime.so')
+              : DynamicLibrary.process())));
 
 /// DLLEXPORT JSValue *jsThrow(JSContext *ctx, JSValue *obj)
 final Pointer<JSValue> Function(