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

Change-Id: I038c941559a275c43c2be7d5453ca4c37390f343
Reviewed-on: https://gerrit.libreoffice.org/7733
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>