RFR: 8238755: allow to create static lib for javafx.media on linux

[Johan Vos]

On Mon, 10 Feb 2020 20:57:30 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> * add support for the "resource" protocol (which is used in the GraalVM URLs pointing to statically bundled resources)
>> * avoid duplicate symbols with different gst plugins
>> * statically register gst plugins
> 
> I added a comment about using an ifdef for `GSTREAMER_LITE` in one of the modified files (the others are fine, since those files are entirely FX_specific).
> 
> One other question: do you need any changes in [ConnectionHolder.java](https://github.com/openjdk/jfx/blob/c334ba810293683b7e510a91be3496f7a872c574/modules/javafx.media/src/main/java/com/sun/media/jfxmedia/locator/ConnectionHolder.java)? That class checks for URL scheme to determine whether a URL is seekable.

As for the ConnectionHolder: the URIConnectionHolder will be used. This indeed will by default return false for `isSeekable` hence that functionality will now not be possible using the "resource" protocol.

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PR: https://git.openjdk.java.net/jfx/pull/109