[oe] uclibc.inc: remove gnu hash for mips and mipsel

[Denis 'Gnutoo' Carikli]

hi,
I had this failure(mips and uclibc wanted gnu hash but GNU hash is incompatible with mips and mipsel):
ERROR: log data follows (/home/embedded/oetmp_wrt54oe/work/wrt54-linux-uclibc/uclibc-initial-0.9.30.1-r2/temp/log.do_configure.22086)
| NOTE: make STRIPTOOL=true LD=mipsel-linux-uclibc-ld LOCALE_DATA_FILENAME=uClibc-locale-030818.tgz CC=ccache mipsel-linux-uclibc-gcc  HOSTCFLAGS=-I/home/embedded/oetmp_wrt54oe/staging/i686-linux/usr/include oldconfig
|   MKDIR include/config
| ../../Rules.mak:543: *** Your binutils don't support --hash-style option, while you want to use it.  Stop.
| make: *** [extra/config/conf] Error 2
| FATAL: oe_runmake failed
| yes: standard output: Broken pipe
| yes: write error
NOTE: Task failed: /home/embedded/oetmp_wrt54oe/work/wrt54-linux-uclibc/uclibc-initial-0.9.30.1-r2/temp/log.do_configure.22086
ERROR: TaskFailed event exception, aborting
ERROR: Build of /home/embedded/oe/org.openembedded.dev/recipes/uclibc/uclibc-initial_0.9.30.1.bb do_configure failed
ERROR: Task 437 (/home/embedded/oe/org.openembedded.dev/recipes/uclibc/uclibc-initial_0.9.30.1.bb, do_configure) failed
NOTE: Tasks Summary: Attempted 155 tasks of which 73 didn't need to be rerun and 1 failed.
ERROR: '/home/embedded/oe/org.openembedded.dev/recipes/uclibc/uclibc-initial_0.9.30.1.bb' failed

it can be fixed with 2 fixes:

the first one is the one that I send for review:
in uclibc.inc it prevent it from having a config that trigger gnu hash

the second one is for distros:
I was told by Tartarus:
May 29 22:11:47 <Tartarus>      I think the right answer is that the logic in conf/distro/include/*.inc needs to get into {eglibc,glibc,uclibc}.inc
May 29 22:11:57 <Tartarus>      yeah, bingo
May 29 22:12:05 <Tartarus>      right now it's in angstrom-*libc.inc and sane-toolchain-*libc.inc

so I added this to the distro I used(wrt54oe):
+require conf/distro/include/sane-toolchain-${LIBC}.inc

and it made it pass the error

Denis