Make sure LG_PAGE <= LG_HUGEPAGE.

This resolves #883.

configure.ac

@@ -1373,6 +1373,10 @@ if test "x${je_cv_lg_hugepage}" = "x" ; then
     je_cv_lg_hugepage=21
   fi
 fi
+if test "x${LG_PAGE}" != "xundefined" -a \
+        "${je_cv_lg_hugepage}" -lt "${LG_PAGE}" ; then
+  AC_MSG_ERROR([Huge page size (2^${je_cv_lg_hugepage}) must be at least page size (2^${LG_PAGE})])
+fi
 AC_DEFINE_UNQUOTED([LG_HUGEPAGE], [${je_cv_lg_hugepage}])
 
 AC_ARG_WITH([lg_page_sizes],