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The 'unistd.h' header was missing. Under some circumstances the
-D_GNU_SOURCE gcc flag does not trigger including that file.
Therefore, explicitly include this file here.
Fixes: e1aec24e84 ("libutil: introduce util_lockfile")
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>