Update to SSCG 4.0.3

• Fix regression introduced in 4.0.1 that prevented writing multiple certificate types to the same output file.
• Don't truncate destination files until just prior to writing.
• Add test for file replacement.
• Use int type for POPT_ARG_NONE values to fix a bug on s390x.
• Don't crash when passed a hostname without a dot (such as localhost)