we use qemu now, test passes

test/nptl/Makefile.in

@@ -9,11 +9,6 @@ ifeq ($(TARGET_ARCH),riscv32)
 TESTS_DISABLED := tst-rwlock9
 endif
 
-# deadlock in nsimdrv
-ifeq ($(TARGET_ARCH),arc)
-TESTS_DISABLED := tst-cancel20
-endif
-
 # qemu crash
 ifeq ($(TARGET_ARCH),microblaze)
 TESTS_DISABLED := tst-tls2 tst-cancelx4 tst-cancelx8 tst-cancelx9 tst-cancelx10 tst-cancelx11 \