PATCH RFA: Add extern "C" to libcpp header files

[Ian Lance Taylor]

This patch adds extern "C" to the header files in libcpp.  This is a
stage toward enabling builds with C++.  My present plan is to have gcc
be built using a C++ compiler but libcpp be built with a C compiler.  In
the future, libcpp will probably move to a C++ compiler as well.  It may
or may not be desirable to retain a C interface even when libcpp is
built with a C++ compiler; I don't know.

Bootstrapped on x86_64-unknown-linux-gnu.  OK for mainline?

Ian


2009-05-31  Ian Lance Taylor  <iant@google.com>

	* include/cpp-id-data.h: Add extern "C".
	* include/line-map.h: Likewise.
	* include/mkdeps.h: Likewise.
	* include/symtab.h: Likewise.
	* internal.h: Likewise.


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