Fix BORINGSSL_NO_CXX.

BSSL_NAMESPACE_BEGIN needs to be defined unconditionally.

Change-Id: I1770ca6b6c19f9c732ef00ba8c89b112b421929d
Reviewed-on: https://boringssl-review.googlesource.com/31824
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/base.h

diff --git a/include/openssl/base.h b/include/openssl/base.h
index b68423e..d134993 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -370,15 +370,6 @@
 #define BORINGSSL_NO_CXX
 #endif
 
-// MSVC doesn't set __cplusplus to 201103 to indicate C++11 support (see
-// https://connect.microsoft.com/VisualStudio/feedback/details/763051/a-value-of-predefined-macro-cplusplus-is-still-199711l)
-// so MSVC is just assumed to support C++11.
-#if !defined(BORINGSSL_NO_CXX) && __cplusplus < 201103L && !defined(_MSC_VER)
-#define BORINGSSL_NO_CXX
-#endif
-
-#if !defined(BORINGSSL_NO_CXX)
-
 #if defined(BORINGSSL_PREFIX)
 #define BSSL_NAMESPACE_BEGIN \
   namespace bssl {           \
@@ -391,6 +382,15 @@
 #define BSSL_NAMESPACE_END }
 #endif
 
+// MSVC doesn't set __cplusplus to 201103 to indicate C++11 support (see
+// https://connect.microsoft.com/VisualStudio/feedback/details/763051/a-value-of-predefined-macro-cplusplus-is-still-199711l)
+// so MSVC is just assumed to support C++11.
+#if !defined(BORINGSSL_NO_CXX) && __cplusplus < 201103L && !defined(_MSC_VER)
+#define BORINGSSL_NO_CXX
+#endif
+
+#if !defined(BORINGSSL_NO_CXX)
+
 extern "C++" {
 
 #include <memory>