sparc: remove unused subdirs variable
sparc: remove unused subdirs variable

For sparc TARGET_SUBARCH is never used. And there is a typo in the
path.

Signed-off-by: Waldemar Brodkorb <9eafb392c2f563112237e0f5b2d5b6a33ad4e183@openadk.org>
Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>

majek/uclibc-vx32,kraj/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,majek/uclibc-vx32,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,kraj/uClibc,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,majek/uclibc-vx32,kraj/uclibc-ng,wbx-github/uclibc-ng,kraj/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,brgl/uclibc-ng,kraj/uClibc,wbx-github/uclibc-ng,brgl/uclibc-ng,majek/uclibc-vx32,kraj/uClibc