2012-07-09 Paul Eggert <eggert@cs.ucla.edu>
+ Merge from gnulib, incorporating:
+ 2012-07-09 timespec: mark functions with const attributes
+
Rename configure.in to configure.ac (Bug#11603).
The name 'configure.in' has been obsolescent for quite some time,
and the next release of Autoconf will generate warnings for it.