Fix recognition of sys/sysctl.h on OpenBSD 4.0.

[pspp] / ChangeLog

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+2009-10-18  Bruno Haible  <bruno@clisp.org>
+
+       Fix recognition of sys/sysctl.h on OpenBSD 4.0.
+       * m4/physmem.m4 (gl_PHYSMEM): Before including sys/sysctl.h, include
+       sys/param.h.
+
 2009-10-16  Eric Blake  <ebb9@byu.net>
 
        utimensat: new module