Fix how we expose rwlock API.
* configure.ac (INSERT_EXPOSE_RWLOCK_API): Don't use CPP macro _NPTH_EXPOSE_RWLOCK_API. * src/npth.h.in: Directly put the subst var of INSERT_EXPOSE_RWLOCK_API.
- Fixes-commit: 223e59f992f9ea63563a8ad070b2f56fb1bbd83b
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>