Add RTLD_NEXT and RTLD_DEFAULT to native config (only run on macOS)

Author: chrisseaton

src/main/java/org/truffleruby/platform/darwin/DarwinNativeConfiguration.java

@@ -601,6 +601,8 @@ public static void load(NativeConfiguration configuration, RubyContext context)
         configuration.config("platform.dlopen.RTLD_NOW", 2);
         configuration.config("platform.dlopen.RTLD_LOCAL", 4);
         configuration.config("platform.dlopen.RTLD_GLOBAL", 8);
+        configuration.config("platform.dlopen.RTLD_NEXT", -1);
+        configuration.config("platform.dlopen.RTLD_DEFAULT", -2);
         configuration.config("platform.clocks.CLOCK_MONOTONIC", 6);
         configuration.config("platform.clocks.CLOCK_MONOTONIC_RAW", 4);
         configuration.config("platform.clocks.CLOCK_MONOTONIC_RAW_APPROX", 5);

tool/generate-native-config.rb

@@ -769,7 +769,7 @@ def constants(name)
 
 constants 'dlopen' do |cg|
   cg.include 'dlfcn.h'
-  cg.consts %w[RTLD_LAZY RTLD_NOW RTLD_LOCAL RTLD_GLOBAL]
+  cg.consts %w[RTLD_LAZY RTLD_NOW RTLD_LOCAL RTLD_GLOBAL RTLD_NEXT RTLD_DEFAULT]
 end
 
 constants 'clocks' do |cg|