[PATCH] Use INCLUDE_xxx macros in gcov.c for pulling in standard C++ headers

[Dimitry Andric <dim at FreeBSD dot org>]

As discussed with the FreeBSD gcc ports maintainer [1], building trunk
gcc with libc++ requires standard C++ headers to be included *before*
gcc/system.h, otherwise the redefinition of abort() to fancy_abort()
will cause trouble.

In r235362, most gcc C++ sources were updated to define INCLUDE_xxx
macros before including gcc/system.h, which fixes the incompatibility
with libc++.  However, gcc/gcov.c was apparently missed.  Attached is a
patch to update it.

-Dimitry

[1] https://bugs.freebsd.org/216303

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