skip the test for get_fpc_csr() on OpenBSD; we do have the function,

but gambit expects union fpc_csr to be present too, which we lack.

lang/gambit/patches/patch-configure

@@ -0,0 +1,14 @@
+$OpenBSD: patch-configure,v 1.1 2012/08/29 18:46:24 jasper Exp $
+--- configure.orig	Wed May 23 11:18:43 2012
++++ configure	Wed Aug 29 12:25:57 2012
+@@ -21131,6 +21131,10 @@ choke me
+ int
+ main ()
+ {
++#if defined(__OpenBSD__)
++#error OpenBSD/mips64(el) does have get_fpc_csr(), but lacks union fpc_csr.
++#endif
++
+ return $ac_func ();
+   ;
+   return 0;