c6x: disable it at the moment
c6x: disable it at the moment

There is a NPTL port of uCLibc for c6x, but it doesn't work
with uClibc master. May be someone with real hardware could
sync it. Unfortunately I got no respone from Aurelien and
no response on the mailing list.

wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,kraj/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,kraj/uclibc-ng,brgl/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng