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/arm_compute/core/NEON/kernels/arm64/NEGEMMLowpAArch64V8P4Kernel.h b/arm_compute/core/NEON/kernels/arm64/NEGEMMLowpAArch64V8P4Kernel.h
index f218e1f..4eab7f9 100644
--- a/arm_compute/core/NEON/kernels/arm64/NEGEMMLowpAArch64V8P4Kernel.h
+++ b/arm_compute/core/NEON/kernels/arm64/NEGEMMLowpAArch64V8P4Kernel.h
@@ -26,6 +26,9 @@
 
 #include "arm_compute/core/NEON/kernels/NEGEMMLowpAssemblyBaseKernel.h"
 
+// Enable only if compiled for AArch64-V8.2-A targets
+#ifdef ARM_COMPUTE_AARCH64_V8_2
+
 namespace arm_compute
 {
 class ITensor;
@@ -42,4 +45,5 @@
     void internal_configure(const ITensor *input0, const ITensor *input1, ITensor *output) override;
 };
 } // namespace arm_compute
+#endif /* ARM_COMPUTE_AARCH64_V8_2 */
 #endif /*__ARM_COMPUTE_NEGEMMLOWPAARCH64V8P4KERNEL_H__*/