fdo#63154 Remove unused solar.h reference in tools

Change-Id: Icd21bbc91ae3587140fe8b0982fc8223fed0903b
Reviewed-on: https://gerrit.libreoffice.org/8505
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>