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 <wbx@openadk.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libpthread/nptl/sysdeps/sparc/Makefile.arch

@@ -4,8 +4,5 @@
 #
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 #
-subdirs += libpthread/nptl/sysdeps/$(TARGET_ARCH)/$(TARGET_SUBARCH)/sparv9
 
 CFLAGS-pthread_spin_lock.c += -D_GNU_SOURCE
-
-