[jfx21u] RFR: 8313856: Replace VLA with malloc in pango

[Jayathirth D V]

On Wed, 9 Aug 2023 05:13:36 GMT, Jayathirth D V <jdv at openjdk.org> wrote:

> This is backport of https://bugs.openjdk.org/browse/JDK-8313856 to jfx21u.
> 
> We should not use stack memory for large VLA allocations in pango.c

@kevinrushforth and @arapte please review.

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PR Comment: https://git.openjdk.org/jfx21u/pull/8#issuecomment-1670699574