COMPMID-634: Enable clang with libc++ to compile for Android (32 and 64 bits)

Change-Id: I693f64e70cd478e93675a8b04360128ded3b60d4
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/93015
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/runtime/NEON/functions/NEGEMMLowp.cpp b/src/runtime/NEON/functions/NEGEMMLowp.cpp
index 716d52a..12136cb 100644
--- a/src/runtime/NEON/functions/NEGEMMLowp.cpp
+++ b/src/runtime/NEON/functions/NEGEMMLowp.cpp
@@ -58,7 +58,7 @@
     const int            cpu_has_dotprod = static_cast<int>(ci.CPU) & static_cast<int>(CPUTarget::DOT);
     if(cpu_has_dotprod != 0)
     {
-#if defined(__aarch64__)
+#ifdef ARM_COMPUTE_AARCH64_V8_2
         // NEGEMMLowpAArch64V8P4Kernel only compiled in AArch64 targets
         _mm_optimised_kernel    = support::cpp14::make_unique<NEGEMMLowpAArch64V8P4Kernel>();
         TensorShape shape_a_int = a->info()->tensor_shape();
@@ -83,7 +83,7 @@
 
         _tmp_a.allocator()->allocate();
         _tmp_b.allocator()->allocate();
-#endif /* defined(__aarch64__) */
+#endif /* ARM_COMPUTE_AARCH64_V8_2 */
     }
     else
     {