fdo#63154 Remove unused solar.h reference in tools

Change-Id: Ic450a82a201cb4da3b0c2992908b597220038871
Reviewed-on: https://gerrit.libreoffice.org/8135
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>