disabled ARC tests working now

As reported by Alexey Brodkin <Alexey.Brodkin@synopsys.com>
these tests do not fail anymore. After upgrading binutils/gcc
tests compile fine.

test/tls/Makefile.in

@@ -12,15 +12,10 @@ ifeq ($(HAVE_SHARED),)
 TESTS_DISABLED := $(TESTS)
 endif
 
-ifeq ($(TARGET_ARCH),arc)
-TESTS_DISABLED += tst-tls12 tst-tls-at-ctor
-endif
-
 # All these tests need tls.h, which is not installed with glibc
 GLIBC_TESTS_DISABLED := $(addsuffix _glibc,$(filter-out $(TESTS_DISABLED),$(TESTS)))
 
 
-
 PTDIR := $(top_builddir)libpthread/nptl
 SYSDEPS_DIR := $(top_srcdir)libc/sysdeps