#23 libexif fails to compile on IRIX 5.3

[Georg Schwarz]

libexif's configre acknowledges with a comment that on
IRIX 5.3 sys/types.h and inttypes.h conflict.
Nevertheless, it creates a libexif/_stdint.h which
unconditionally includes inttypes.h.
The only workaround I could come up with to make libexif
compile on IRIX 5.3 was to manually change libexif/
_stdint.h like this:

#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#else
#include <sys/types.h>
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#endif

[Hans Ulrich Niedermann]

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I'll take this into account when reworking the _stdint.h
generation