Update libmagic.patch

Some commits missed to update the patch file, so we're catching up on
this.

To generally make this easier, we back-port generate_patch.sh from
PHP-7.4,

Update libmagic.patch

Some commits missed to update the patch file, so we're catching up on
this.

To generally make this easier, we back-port generate_patch.sh from
PHP-7.4, where we now also generate magic.h from magic.h.in.

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