Adding SH support to glibc-2.1.3

[NIIBE Yutaka]

Ulrich Drepper wrote:
 > Changing the patches for 2.2 is definitely required.

OK, will do.

BTW, I have a question about multilib.  There's two processor type,
SH-3 and SH-4.  SH-4 has FPU and larger cache.  All the (user space)
code compiled for SH-3 works on SH-4.  Besides, both processor
support both endianess.  In GCC, they are supported by multilib.  

In GCC, target sh-unknown-linux-gnu builds, say:

	libgcc.a            ----- SH-3 little endian
	m4/libgcc.a	    ----- SH-4 little endian
	mb/libgcc.a         ----- SH-3 big endian
	mb/m4/libgcc.a	    ----- SH-4 big endian
(actually, sh-unknown-linux-gnu are not yet supported in GCC, we'll
send patches)

Should we support things like this for GNU C Library?  Currently, I do
configure for each target (sh3-unknown-linux-gnu,
sh4-unknown-linux-gnu with different compiler switch (-mb for
bigendian)), on installation.  It would be better it built all of them
with target sh-unknown-linux-gnu...

Please let me know your opinion.
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