fdo#63154 remove unused solar.h reference in tools

Change-Id: I1ad2f6323a787b9ea38031a1427d99dd47f5e030
Reviewed-on: https://gerrit.libreoffice.org/8373
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Marcos Souza <marcos.souza.org@gmail.com>