[Cin] Improved Gradient Plugin

[Phyllis Smith]

IgorB:
Yeah! we found a bug now.  Could you try the latest test build on simple
test file?  Simple test files is at:
https://www.datafilehost.com/d/a07d5d03

New build with fix in is at:
https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-ub16-x86_64-static.txz

Unfortunately it doesn't work.

> I have done a quickly screencast where you can see with:
> - X11 Video Driver (okay);
> - OpenGL and Disable OpenGL checkbox= disable;
> - OpenGL and Disable OpenGL checkbox= enable;
>
>
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