iozone: remove dead code for !thread handling

iozone requires thread support since commit
06b53255cf639a5b033a2cdbfcf114770b94a83b, so having code to handle the
non-threaded case in the .mk file is useless.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/iozone/iozone.mk

@@ -11,11 +11,8 @@ IOZONE_LICENSE = IOzone license (NO DERIVED WORKS ALLOWED)
 # IOzone license details can be found at:
 # http://www.iozone.org/docs/Iozone_License.txt
 
-# No threading target is non-AIO as well
-ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),)
-IOZONE_TARGET = linux-noth
 # AIO support not available on uClibc, use the linux (non-aio) target.
-else ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
+ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
 IOZONE_TARGET = linux-noaio
 else
 IOZONE_TARGET = linux