2013-03-13 Paul Eggert <eggert@cs.ucla.edu>
Merge from gnulib, incorporating:
+ 2013-03-13 putenv: port to Solaris 10
2013-03-12 mktime: fix configure typo
2013-03-11 regex: port to mingw's recent addition of undeclared alarm
2013-03-11 putenv: avoid compilation warning on mingw