cppmacro.c (cpp_scan_buffer_nooutput): Take a boolean indicating whether to scan all buffers on the stack or just one.

        * cppmacro.c (cpp_scan_buffer_nooutput): Take a boolean
        indicating whether to scan all buffers on the stack or
        just one.
        * cppinit.c (do_includes): Update.
        * cppmain.c (main): Update.
        * cpplib.h: Update prototype.

From-SVN: r37829