Move libstdc++ into libc.

The Android build system always links against libstdc++.so anyway. Having
operator new and operator delete in a separate library means we can't use
constructors and destructors on heap-allocated objects inside the C library,
which is quite an unfortunate limitation.

This will be cheaper too; on LP64 we can stop linking against the [now empty]
libstdc++.so giving the dynamic linker one less library to worry about for
every process.

There's precedent too --- we already have no libpthread or librt.

For now I'm leaving the include files where they are, and I'm generating a
dummy libstdc++.so and libstdc++.a. We can come back and clean that up later
if all goes well.

Bug: 13367666
Change-Id: I6f3e27ea7c30d03d6394965d0400c9dc87fa83db
diff --git a/libc/bionic/__cxa_pure_virtual.cpp b/libc/bionic/__cxa_pure_virtual.cpp
new file mode 100644
index 0000000..30b581f
--- /dev/null
+++ b/libc/bionic/__cxa_pure_virtual.cpp
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <private/libc_logging.h>
+
+extern "C" void __cxa_pure_virtual() {
+  __libc_fatal("Pure virtual function called. Are you calling virtual methods from a destructor?");
+}