Add RTLD_DEEPBIND flag to dlopen mode (#2247)

Author: snnz

binding/Binding.Shared/LibraryLoader.cs

@@ -202,16 +202,17 @@ private static class Linux
 
 			private const int RTLD_LAZY = 1;
 			private const int RTLD_NOW = 2;
+			private const int RTLD_DEEPBIND = 8;
 
 			private static bool UseSystemLibrary2 = true;
 
 			public static IntPtr dlopen (string path, bool lazy = true)
 			{
 				try {
-					return dlopen2 (path, lazy ? RTLD_LAZY : RTLD_NOW);
+					return dlopen2 (path, (lazy ? RTLD_LAZY : RTLD_NOW) | RTLD_DEEPBIND);
 				} catch (DllNotFoundException) {
 					UseSystemLibrary2 = false;
-					return dlopen1 (path, lazy ? RTLD_LAZY : RTLD_NOW);
+					return dlopen1 (path, (lazy ? RTLD_LAZY : RTLD_NOW) | RTLD_DEEPBIND);
 				}
 			}