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arm: assume NEON if built with it

Downstream may build with -march=armv7-a and/or -mfpu=neon or have
those enabled by default e.g., on FreeBSD armv7. There's no point
detecting NEON then only to fail if OS doesn't support getauxval().

--- a/src/arm/cpu.c

+++ b/src/arm/cpu.c

@@ -72,6 +72,8 @@

     unsigned flags = 0;

 #if ARCH_AARCH64

     flags |= DAV1D_ARM_CPU_FLAG_NEON;

+#elif defined(__ARM_NEON)

+    flags |= DAV1D_ARM_CPU_FLAG_NEON;

 #elif defined(HAVE_GETAUXVAL) && ARCH_ARM

     unsigned long hw_cap = getauxval(AT_HWCAP);

     flags |= (hw_cap & NEON_HWCAP) ? DAV1D_ARM_CPU_FLAG_NEON : 0;