exiftool: upgrade 12.70 -> 12.71

Changelog:
============
- Added a warning if there was an error reading an alternate file with the
  -fileNUM option
- Added the ability to write QuickTime Keys:Encoder
- Added a few new Canon LensType values
- Added a new, obscure EXIF tag
- Decode real-time metadata from Ricoh Theta videos
- Decode SpecularWhiteLevel for more Canon models (github #232)
- Decode Canon DualPixelRaw tag
- Decode a few new Nikon tags
- Decode more FujiFilm M-RAW tags
- Improved generation of tag names for some JSON tag ID's containing colons
- Fixed "Undefined subroutine" error when writing makernotes as a block
- Fixed missing ID in family 7 group name for ID3 tags which are not valid for
  the specified ID3 version
- Fixed bug where some tags from alternate files (with the -fileNUM option)
  could show up as "not defined" when used in expressions even though they did
  exist
- API Changes:
    - Added NoMandatory option

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/perl/exiftool_12.71.bb

@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://perl-Image-ExifTool.spec;beginline=5;endline=5;md5=ff
 
 inherit cpan
 
-SRCREV = "bec8a1bff8a97ea8f2895e7e5c5e396e0e48d419"
+SRCREV = "7cefbaaa9057231b6e9b5765934f06e75994420d"
 SRC_URI = "git://github.com/exiftool/exiftool;protocol=https;branch=master"
 
 S = "${WORKDIR}/git"