Log Message:
security/openpam: define NO_STATIC_MODULES on NetBSD

This is a hack to work around a mistake in the NetBSD openpam build
which leaked into the public header files.  We will fix this in the
NetBSD build but it's been in the public header files for nearly a
decade now, with each individual pam module sometimes having this
workaround, so let's apply the workaround uniformly for now.

PR security/39313
PR security/55216