Removal of <strstream> from include files

[Marshall Clow]

While discussing the status of <strstream> in C++14, I decided to search through the LLVM/clang code base for uses of strstream.

I didn't find any, just a header file that includes <strstream>.

Here's a patch that removes that. This should (marginally) speed up builds.

Also, I removed a mention of <strstream> from a test for "has_header" - I used <new> instead.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki
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