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

Change-Id: I0452b1fa83c52a7466a025259b086e82ec1dba83
Reviewed-on: https://gerrit.libreoffice.org/7734
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>