...but itself includes svl/source/passwordcontainer/syscreds.hxx, which only
happens to work because of -I$(dir $(3)) in gb_CObject__command_pattern (in
solenv/gbuild/platform/com_{GCC,MSC}_class.mk).  Clean that up by moving the
file.

Change-Id: I7a04f757becf8113d1dccae9b78870e57ad3fbe5
Reviewed-on: https://gerrit.libreoffice.org/44171Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>