libextrator: Update to libextractor-1.9 (from ng0 via wip)

upstream changes:
* CVEs fixed in or before version 1.9: CVE-2018-20430, CVE-2018-20431, CVE-2017-15922, CVE-2017-17440
* upstream ChangeLog:
Sun 10 Feb 2019 05:05:22 PM CET
Added Danish translation.
Releasing GNU libextractor 1.9. -CG

Thu Dec 20 22:48:47 CET 2018
Fix #5493: possible out-of-bounds read in libextractor_common
in case of iconv() failure.
Fix #5494: NULL dereference in OLE2 extractor (for malformed input). -CG

Sun Dec  2 12:05:33 CET 2018
Fix #5488: do not export non-public functions from API. -CG

(gdt)