package/exiv2: bump version to 0.27.3

package/exiv2: bump version to 0.27.3

Bump version 0.27.3 and remove 0001[1] and 0002[2] local patches that
has been upstreamed.

Release notes:
https://github.com/Exiv2/exiv2/blob/v0.27.3/releasenotes/releasenotes.txt

[1]: https://github.com/Exiv2/exiv2/commit/b7890776c62398ca1005e8edc32786859d60fcf7
[2]: https://github.com/Exiv2/exiv2/commit/1b917c3f7dd86336a9f6fda4456422c419dfe88c

Signed-off-by: Nicolas Serafini <nicolas.serafini@sensefly.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>