Pavel Labath 0583d7a56c Make test sources compatible with android+libcxx+modules
In a modules build, android is very picky about which symbols are
visible after including libc++ headers (e.g. <cstdio> defines only
std::printf and not ::printf).

This consolidates the tests where this was an issue to always include
the <c???> version of the headers and prefixes the symbols with std:: as
necessary.

Apart from that, there is no functional change in the tests.

llvm-svn: 335149
2018-06-20 17:32:48 +00:00
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