audio_filter: simple: rename CAN_COMPILE_ARM define

Since it's used only for the neon case.

modules/audio_filter/Makefile.am

@@ -69,7 +69,7 @@ EXTRA_LTLIBRARIES += libsimple_channel_mixer_plugin_arm_neon.la
 libsimple_channel_mixer_plugin_arm_neon_la_SOURCES = arm_neon/simple_channel_mixer.S
 
 libsimple_channel_mixer_plugin_la_LIBADD += libsimple_channel_mixer_plugin_arm_neon.la
-libsimple_channel_mixer_plugin_la_CFLAGS += -DCAN_COMPILE_ARM
+libsimple_channel_mixer_plugin_la_CFLAGS += -DCAN_COMPILE_NEON
 endif
 
 audio_filter_LTLIBRARIES += \

modules/audio_filter/channel_mixer/simple.c

@@ -258,7 +258,7 @@ static void DoWork_6_1_to_5_x( filter_t * p_filter,  block_t * p_in_buf, block_t
     }
 }
 
-#if defined (CAN_COMPILE_ARM)
+#if defined (CAN_COMPILE_NEON)
 #include "simple_neon.h"
 #define GET_WORK(in, out) GET_WORK_##in##_to_##out##_neon()
 #else