Improve the styling of browser file input controls. Fixes #26393.
Built from https://develop.svn.wordpress.org/trunk@26615


git-svn-id: http://core.svn.wordpress.org/trunk@26505 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Build RTL stylesheets for color schemes.

props dd32.
fixes #26315.

Built from https://develop.svn.wordpress.org/trunk@26616


git-svn-id: http://core.svn.wordpress.org/trunk@26506 1a063a9b-81f0-0310-95a4-ce76da25c4cd