Check if RTLD_DEEPBIND is defined before using it.

base/native_library_posix.cc

Index: base/native_library_posix.cc
diff --git a/base/native_library_posix.cc b/base/native_library_posix.cc
index 786333e65ae147648309ffb82aaf506616d690c9..3459716af1c68d550fe246b70d3d70979a736efd 100644
--- a/base/native_library_posix.cc
+++ b/base/native_library_posix.cc
@@ -30,10 +30,10 @@ NativeLibrary LoadNativeLibraryWithOptions(const FilePath& library_path,
   // http://crbug.com/17943, http://crbug.com/17557, http://crbug.com/36892,
   // and http://crbug.com/40794.
   int flags = RTLD_LAZY;
-#if defined(OS_ANDROID)
-  // Android dlopen() requires further investigation, as it might vary across
-  // versions. Crash here to warn developers that they're trying to rely on
-  // uncertain behavior.
+#if defined(OS_ANDROID) || !defined(RTLD_DEEPBIND)
+  // Certain platforms don't define RTLD_DEEPBIND. Android dlopen() requires
+  // further investigation, as it might vary across versions. Crash here to
+  // warn developers that they're trying to rely on uncertain behavior.
   CHECK(!options.prefer_own_symbols);
 #else
   if (options.prefer_own_symbols)