libexif: Update to 0.6.22

libexif: Update to 0.6.22

- Update from 0.6.21 (2012) to 0.6.22 (2020)
- Update rootfile
- Changelog
  * New translations: ms
  * Updated translations for most languages
  * Fixed C89 compatibility
  * Fixed warnings on recent versions of autoconf
  * Some useful EXIF 2.3 tag added:
    * EXIF_TAG_GAMMA
    * EXIF_TAG_COMPOSITE_IMAGE
    * EXIF_TAG_SOURCE_IMAGE_NUMBER_OF_COMPOSITE_IMAGE
    * EXIF_TAG_SOURCE_EXPOSURE_TIMES_OF_COMPOSITE_IMAGE
    * EXIF_TAG_GPS_H_POSITIONING_ERROR
    * EXIF_TAG_CAMERA_OWNER_NAME
    * EXIF_TAG_BODY_SERIAL_NUMBER
    * EXIF_TAG_LENS_SPECIFICATION
    * EXIF_TAG_LENS_MAKE
    * EXIF_TAG_LENS_MODEL
    * EXIF_TAG_LENS_SERIAL_NUMBER
  * Lots of fixes exposed by fuzzers like AFL, ClusterFuzz, OSSFuzz and others.
    * CVE-2018-20030: Fix for recursion DoS
    * CVE-2020-13114: Time consumption DoS when parsing canon array markers
    * CVE-2020-13113: Potential use of uninitialized memory
    * CVE-2020-13112: Various buffer overread fixes due to integer overflows in maker notes
    * CVE-2020-0093: read overflow
    * CVE-2019-9278: replaced integer overflow checks the compiler could optimize away by safer constructs
    * CVE-2020-12767: fixed division by zero
    * CVE-2016-6328: fixed integer overflow when parsing maker notes
    * CVE-2017-7544: fixed buffer overread

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>