fdo#63154 Remove unused solar.h ref. in tools

Change-Id: Iedcf030178c4bf875db01ba6b1f5202dae18bca2
Reviewed-on: https://gerrit.libreoffice.org/8134
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>