[Bug Report] Dev build from source fails

### Element UI version
2.13.0

### OS/Browsers version
Linux (Kubuntu 19)

### Vue version
2.6.10

### Reproduction Link
https://github.com/ElemeFE/element.git#dev

### Steps to reproduce
Simply clone the dev branch

And run `npm install && npm run dist`

### What is Expected?
The build process to run successfully

### What is actually happening?
The build process fails at 89% with a ton of errors like the following

```
ERROR in ./packages/tooltip/src/main.js 81:8
Module parse failed: Unexpected token (81:8)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
| if (this.popperVM) {
| this.popperVM.node = (
>
@ ./packages/tooltip/index.js 1:0-33 4:0-7 5:16-23 5:30-37 8:15-22
@ ./src/index.js
@ multi ./src/index.js
```
It seems like the jsx loader is not correctly configured