Only use NEON memcpy if __ARM_NEON__ is defined

Change-Id: I32e6b9385d46efeec15dee8e395a82eef24ba3ea
diff --git a/libc/arch-arm/bionic/memcpy.S b/libc/arch-arm/bionic/memcpy.S
index 024d885..ba55996 100644
--- a/libc/arch-arm/bionic/memcpy.S
+++ b/libc/arch-arm/bionic/memcpy.S
@@ -28,7 +28,7 @@
 
 #include <machine/cpu-features.h>
 
-#if __ARM_ARCH__ == 7 || defined(__ARM_NEON__)
+#if defined(__ARM_NEON__)
 
         .text
         .fpu    neon