This avoids cluttering the source code with VMS-specific changes.
* include/freetype/internal/ftcalc.h [__VMS], src/base/ftcalc.c
[vms_auto64_source]: Remove.
* builds/vms/patch_ftcalc.sed: New file.
* vms_make.com: Change macro definitions while this script is running; we
use `GNU sed` to inject the necessary preprocessor code on the fly.
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