vim-patch:8.1.1930: cannot recognize .jsx and .tsx files

Problem:    Cannot recognize .jsx and .tsx files.
Solution:   Recognize them as javascriptreact and typescriptreact.
            (closes vim/vim#4830)
https://github.com/vim/vim/commit/92852cee3fcff1dc6ce12387b234634e73267b22

runtime/ftplugin/javascriptreact.vim

@@ -0,0 +1,2 @@
+" Placeholder for backwards compatilibity: .jsx used to stand for JavaScript.
+source %:h/javascript.vim