build: Fix removal of AC_TYPE_SIGNAL.
* configure.ac: AC_TYPE_SIGNAL is still needed.
- Fixes-commit: d5f9481186eaf2ff28d7ab04fd36f0bbd1c9714d
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
build: Fix removal of AC_TYPE_SIGNAL. Tags None Subscribers None
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