examples: Work around lack of mingw sigaction()
mingw lacks sigaction(); we were getting it from gnulib. But since commit acf522e8 stopped linking examples against gnulib, we are getting a build failure. Keep the examples standalone, and work around mingw by using signal() instead. Signed-off-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
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