Bug#763711: texlive-bin: FTBFS on arm64

[Norbert Preining <preining@logic.at>]

Hi Wookey,

> This version of texlive-bin does not build on arm64 due to the
> internal libpng trying to use 32-bit neon code (neon is ARM SIMD
> unit). The attached simple patch correctly restricts that code to the
> right architectures.

Thanks for the patch, I saw the FTBFS in the logs and planned to 
start bothering someone sooner or later ;-)

Uploaded already

Norbert

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PREINING, Norbert                               http://www.preining.info
JAIST, Japan                                 TeX Live & Debian Developer
GPG: 0x860CDC13   fp: F7D8 A928 26E3 16A1 9FA0  ACF0 6CAC A448 860C DC13
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