[PATCH xserver] meson: Make it possible to build for 32-bit targets

[Eric Anholt]

Jon Turney <jon.turney at dronecode.org.uk> writes:

> Setting glx_align64 to '' gives a null string in the arguments list passed
> to the compiler.  This is taken as an input filename, leading to:
>
> "cc: error: : No such file or directory"
>
> Instead, assign an empty list to glx_align64, which gets flattened to
> nothing in the arguments list.
>
> Signed-off-by: Jon Turney <jon.turney at dronecode.org.uk>

Reviewed and pushed.  Thanks!
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