fdo#63154 Removed unused solar.h ref. in linguc., sfx2, starmath, svl and svx

Change-Id: I241661119371b75804fcf9215ff5e5da2a5b9265
Reviewed-on: https://gerrit.libreoffice.org/7732
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>