rtl/string.hxx and rtl/ustring.hxx both unnecessarily #include <sal/log.hxx> (and don't make use of it themselves), but many other files happen to depend on it.
This is a continuation of commit 6ff2d84a to be able to remove those unneeded includes.

This commit adds missing headers to every file found by:
grep -FwL sal/log.hxx $(git grep -Elw 'SAL_INFO|SAL_INFO_IF|SAL_WARN|SAL_WARN_IF|SAL_DETAIL_LOG_STREAM|SAL_WHERE|SAL_STREAM|SAL_DEBUG')
to directories w* x*

Change-Id: I27bff44da3d34d24262031c7489e755311599bc5
Reviewed-on: https://gerrit.libreoffice.org/57307
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>