package/ripgrep: depends on host-rustc

package/ripgrep: depends on host-rustc

As all providers of rustc also install cargo, there is no need to depend
on the standalone cargo package anymore. Instead add host-rustc to the
dependency list.

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Signed-off-by: Patrick Havelange <patrick.havelange@essensium.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: David Pierret <david.pierret@smile.fr>
Tested-by: David Pierret <david.pierret@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>