Bug#786934: Compile error from clang-3.5 in C++. Include std-header in user definition namespace.

[Narusawa Yu]

Package: clang-3.5
Version: 1:3.5~svn212963-1~exp1
Severity: minor

 Hi. I caught bug from clang-3.5.

C++ source code.

```cpp
#include <iostream>

namespace NameSpace {
#include <vector>
}

int main()
{
    return 0;
}
```

Compile.

```bash
$ clang++ -std=c++1z test.cpp
```

Result. This full log is 'build.log' in archive file.

```bash
...
clang: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/test-95ce5b.cpp
clang: note: diagnostic msg: /tmp/test-95ce5b.sh
clang: note: diagnostic msg:

********************
```

Environs.

```bash
$ uname -a
Linux deb 3.2.0-4-486 #1 Debian 3.2.68-1+deb7u1 i686 GNU/Linux

$ which clang++
/usr/bin/clang++

$ dpkg --search `which clang++`
clang-3.5: /usr/bin/clang++

$ `which clang++` --version
Debian clang version 3.5.0-1~exp1 (trunk) (based on LLVM 3.5.0)
Target: i386-pc-linux-gnu
Thread model: posix
```

Thanks.
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