Please rev. libexif to prevent segfault

[David Arnstein]

The default version of the libexif package seems to be 0.6.12-1. There
is a fatal error in this version. It has been fixed in 0.6.13

In exif-data.c, there is a single line of code
	if (s & 1) *ds++;

The author really wanted
	if (s & 1) (*ds)++;

This bug will be exercised whenever a certain EXIF record has an odd
number of bytes. At that point, a program crash is all but certain. 


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