package/gawk: create awk symlink for host-gawk

package/gawk: create awk symlink for host-gawk

This is to make sure that host packages that depend on `host-gawk` and that use
`awk` end up using `gawk`, instead of the `awk` symlink installed on the host
system.

On recent Debian-based distributions, `awk` is still symlinked to `mawk` [1].

[1] https://bugs.launchpad.net/ubuntu/+source/mawk/+bug/1841654

Signed-off-by: Hubert Lacote <hubert.lacote@youview.com>
Co-authored-by: Hubert Lacote <hubert.lacote@youview.com>
Co-authored-by: Vicente Olivert Riera <vincent.olivert.riera@youview.com>
[yann.morin.1998@free.fr: move after the target symlink hook]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>