install/{consolefont,keymap}: use rc.conf if no vconsole.conf

classabbyamprequested to merge
classabbyamp/mkinitcpio:rc-conf into master

Void uses /etc/rc.conf for things like console font and console keymap, while systemd uses /etc/vconsole.conf for that purpose. Use rc.conf as a fallback if console.conf doesn't exist.

upstream-compatible version of void's patch

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