SH Linux: remove big endian multilib

[NIIBE Yutaka]

Alexandre Oliva wrote:
 > That's the default target and endianness of sh-linux-gnu, indeed.  But
 > will also attempt to build a number of other multilibs, and fail at
 > that because it won't be able to create libgcc_s.so for any of them
 > unless the builder has previously set up a multilibbed glibc
 > environment.

May I clarify this description?

---------
For Linux, to build entire GCC, builder needs GNU C library properly
installed previously.

In the case of sh-linux-gnu, GNU C library needs to be installed as
multilibbed environment.
---------

It seems that a builder installs sh3-linux-gnu GNU C library (only)
and try to build entire sh-linux-gnu GCC.  Do we really support such a
funny way of building GCC?  Why not it's sh3-linux-gnu target, then?
I understand we have troubles in this situation, but it's because
a builder does wrong thing.

Andrew, could you please explain the situation?  Do you success to
build sh3-linux-gnu GCC with sh3-linux-gnu glibc?
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