From Albert Chin: in a test program, include <glibconfig.h> rather than

From Albert Chin: in a test program, include <glibconfig.h> rather than
<glib.h> when checking for the format for 64-bit integers, as, on
Solaris 2.5.1, <glib.h> ends up defining a function that requires stuff
from glib, and the test program isn't linked with glib - including
<glibconfig.h> is sufficient to get guint64 defined, and that's all we
need.

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