Meson install warnings when running postgres build from a sandbox

If I run postgres builds from a bazel sandbox whereby the source directory consists of symlinks that point to the original source files.

Meson has traditionally followed these symlinks, but since 1.3, any of the install_* functions produce a warning:

The [[install_data]], [[install_headers]], [[install_subdir]] functions now

have an optional argument `follow_symlinks` that, if set to `true`, makes it so

symbolic links in the source are followed, rather than copied into the

destination tree, to match the old behavior.  The default, which is currently

to follow links, is subject to change in the future.

This is all ok for now, but I'm wondering if meson changes the default behavior in a future version, how postgres would be able to support the old way of following symlinks with said future version. 

This would require a new build option in combination with setting follow_symlinks to this option value, but I also noticed that postgres supports a minimum version of >=0.57.2 which does not have this arg on any of the install_* functions.

Thanks
 

Matt