fdo#63154 Removed unused solar.h ref. in vcl

Change-Id: Ibbc80b09a288494baae4e5ebee4428a6a80a904a
Reviewed-on: https://gerrit.libreoffice.org/7738
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>