Fix libstdc++ compiling for an aarch64 multilib with big-endian.

2019-12-07  Andrew Pinski  <apinski@marvell.com>

        * config/cpu/aarch64/opt/ext/opt_random.h: Wrap around with check
        for little-endian like ext/random is done.

From-SVN: r279081

libstdc++-v3/ChangeLog

+2019-12-07  Andrew Pinski  <apinski@marvell.com>
+
+	* config/cpu/aarch64/opt/ext/opt_random.h: Wrap around with check
+	for little-endian like ext/random is done.
+
 2019-12-05  Jonathan Wakely  <jwakely@redhat.com>
 
 	* testsuite/23_containers/span/lwg3255.cc: Fix test. Constructing a

libstdc++-v3/config/cpu/aarch64/opt/ext/opt_random.h

@@ -44,6 +44,7 @@
      _C+8, _C+9, _C+10, _C+11, _C+12, _C+13, _C+14, _C+15})
 #endif
 
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 namespace __gnu_cxx _GLIBCXX_VISIBILITY (default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -175,6 +176,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
   } // namespace
 
+#endif // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #endif // __ARM_NEON
 
 #endif // _EXT_OPT_RANDOM_H