[PATCH] docs/compiling: Add note on how to check minimum meson version

[Erik Skultety]

On Tue, Mar 16, 2021 at 10:24:55AM +0100, Peter Krempa wrote:
> Give guidance on how to check minimum meson version for a given package.
> 
> Resolves: https://gitlab.com/libvirt/libvirt/-/issues/140
> Signed-off-by: Peter Krempa <pkrempa at redhat.com>

facepalm...the whole point of the conversion of this file to RST was to close
the issue..and then I forgot about it.

Reviewed-by: Erik Skultety <eskultet at redhat.com>