macosx: prepare the switch from dyld to 'Dynamic Loader Compatibility...

macosx: prepare the switch from dyld to 'Dynamic Loader Compatibility Functions' as partially intended by [7147338b]

Using Apple's legacy object file image functions around NSModule is strongly discouraged and won't work in the future at all.

configure.ac

@@ -791,7 +791,7 @@ if test "${ac_cv_have_plugins}" = "no"; then
 fi
 
 # Only test for dlopen() if the others didn't work
-if test "${ac_cv_have_plugins}" = "no"; then
+if test "${ac_cv_have_plugins}" = "no" -o "${SYS}" = "darwin"; then
   AC_CHECK_HEADERS(dlfcn.h sys/dl.h)
   ac_cv_my_have_dlopen=no
   AC_CHECK_FUNC(dlopen,

src/modules/modules.h

@@ -76,7 +76,7 @@ struct module_cache_t
 #define MODULE_SHORTCUT_MAX 50
 
 /* The module handle type. */
-#if defined(HAVE_DL_DYLD)
+#if defined(HAVE_DL_DYLD) && !defined(__x86_64__)
 #   if defined (HAVE_MACH_O_DYLD_H)
 #       include <mach-o/dyld.h>
 #   endif