Add '-read_only_relocs warning' to LDDLLFLAGS on Darwin.

diff --git a/configure b/configure
index 508d028..26e961f 100755
--- a/configure
+++ b/configure
@@ -14109,7 +14109,7 @@
           if test "$ac_cv_c_dll_macho" = "yes"
           then
             LIBEXT="dylib"
-            LDDLLFLAGS="-bundle -flat_namespace -undefined suppress"
+            LDDLLFLAGS="-bundle -flat_namespace -undefined suppress -read_only_relocs warning"
             LDSHARED="\$(CC) -dynamiclib"
             CFLAGS="$CFLAGS -ffixed-r13 -no-cpp-precomp"
             STRIP="$STRIP -u -r"