[PATCH] PR libstdc++/88066 use <> for includes not ""

[Jonathan Wakely <jwakely at redhat dot com>]

Using #include "..." to include a header in the same directory fails if
the user compiles with -I-, so always use something like <bits/...> for
internal headers.

I haven't added tests for this, because dg-options adds options to the
end, and the position of -I- matters (if it's at the end then the tests
won't find any headers in the build tree, as they're specified by -I
options earlier in the flags). It's been manually tested though.

	PR libstdc++/88066
	* include/bits/locale_conv.h: Use <> for includes not "".
	* include/ext/random: Likewise.
	* include/ext/vstring.h: Likewise.

Apparently I never sent this to the mailing lists. It was committed to
trunk a month ago, and now to gcc-8-branch too.

Attachment: patch.txt
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