contrib: speexdsp: disable neon on aarch64

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 9cf85e3ab92718d8a9ec661cd671b7e7a4289d58)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/speexdsp/rules.mak

@@ -23,7 +23,8 @@ speexdsp: speexdsp-$(SPEEXDSP_VERSION).tar.gz .sum-speexdsp
 	$(MOVE)
 
 SPEEXDSP_CONF := --enable-resample-full-sinc-table --disable-examples
-ifndef HAVE_NEON
+ifeq ($(ARCH),aarch64)
+# old neon, not compatible with aarch64
 SPEEXDSP_CONF += --disable-neon
 endif
 ifndef HAVE_NEON