ARC: remove stale TRUNCATE64_HAS_4_ARGS

Not relevant anymore since commit e8cc14e59ed3f66b84e,
"libc: rename TRUNCATE64_HAS_4_ARGS to SYSCALL_ALIGN_64BIT"

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/arc/bits/uClibc_arch_features.h

@@ -17,9 +17,6 @@
 /* can your target use syscall6() for mmap ? */
 #undef __UCLIBC_MMAP_HAS_6_ARGS__
 
-/* does your target use syscall4() for truncate64 ? (32bit arches only) */
-#undef __UCLIBC_TRUNCATE64_HAS_4_ARGS__
-
 /* does your target have a broken create_module() ? */
 #undef __UCLIBC_BROKEN_CREATE_MODULE__