make high precision mode accessible at compile time

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8470 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/resample2.c

@@ -30,7 +30,7 @@
 #include "common.h"
 #include "dsputil.h"
 
-#if 1
+#ifndef CONFIG_RESAMPLE_HP
 #define FILTER_SHIFT 15
 
 #define FELEM int16_t