[v3, 3.4 & HEAD] set cpu_include_dir for mips*-*-linux* and arm*-linux-* targets, update baseline file

[Paolo Carlini]

Matthias Klose wrote:

>The test in acinclude.m4 uses it:
>
>dnl
>dnl Check to see what architecture and operating system we are compiling
>dnl for.  Also, if architecture- or OS-specific flags are required for
>dnl compilation, pick them up here.
>dnl
>AC_DEFUN([GLIBCXX_CHECK_HOST], [
>  . $glibcxx_srcdir/configure.host
>  AC_MSG_NOTICE([CPU config directory is $cpu_include_dir])
>  AC_MSG_NOTICE([OS config directory is $os_include_dir])
>])
>
>either cpu_include_dir should be updated in configure.host or the
>message be changed.
>  
>
Ok, thanks, now I see: it's mips-specific, due to the hacks used to deal 
with
the variants that can/can't use mips/atomicity.h. But notice that this
additional line has *nothing* to do with the abi baseline, you are fixing a
different, pre-existing, problem and as such you should document it in
the ChangeLog. Ok, with me, then.

Thanks again,
Paolo.