[Cin] two patches for vframe.C and trackcanvas.C

[Phyllis Smith]

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> https://github.com/vanakala/cinelerra-cve/commit/167b63df12cc4106359645d1752e0f2136ec7a7f
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> "Align VFrame rows to 16 byte boundary
> Should make video transformations more cpu cache friendly"
>
> it compiles and runs - can anyone check performance impact?
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Uh,oh.  Tested on an older HP laptop, but not using Big Buck Bunny and
after loading and then playing, it immediately crashes.
writing debug data to /tmp/cinelerra_853654.dmp
lock_items: 22
lock_frees: 4
** dump complete
Segmentation fault (core dumped)
I assume it is the 0002-align-vframe... causing the crash and not
0001-cppcheck...
Will test some more later just to make sure.
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