libc/uClibc: add workaround patch for ICE in m68k builds

This patch/workaround is similar to the one proposed in
http://www.mail-archive.com/uclibc@uclibc.org/msg02475.html

Bug reproduced with GCC 4.6.3.

[ALL ] In file included from libc/inet/inet_ntoa.c:8:0:
[ALL ] libc/inet/addr.c: In function 'inet_ntoa_r':
[ALL ] libc/inet/addr.c:135:1: warning: visibility attribute not supported in this configuration; ignored [-Wattri
butes]
[ERROR] libc/inet/addr.c:135:1: internal compiler error: in output_move_qimode, at config/m68k/m68k.c:3160

Signed-off-by: "Esben Haabendal" <esben@haabendal.dk>
Message-Id: <87sja4d1ke.fsf@arh128.prevas.dk>
Patchwork-Id: 187181

# MicroBlaze specific config options

## depends on EXPERIMENTAL

##

## select ARCH_SUPPORT_ARCH

## select ARCH_FLOAT_SW

## select ARCH_SUPPORTS_BOTH_ENDIAN

## select ARCH_DEFAULT_BE

## select ARCH_SUPPORTS_BOTH_MMU

## select ARCH_DEFAULT_HAS_MMU

##

## help The MicroBlaze architecture, as defined by:

## help 	http://www.xilinx.com/

## help 

## help Upstream projects do not currently provide

## help full support for the microblaze architecture

## help and as such, this is marked as EXPERIMENTAL

## help for CT-NG.

## help 

## help Support is being added for a modern gcc,

## help binutils and gdb along with nptl threading

## help in eglibc for microblaze.