Fix voice ap for Raspberry Pi (#100)

Make dynwin member of cst_db `const float *` (it is always used as this type)
This seems to fix the voice *ap* for raspberry pi (but I don't know why)

Author: forslund

include/cst_cg.h

@@ -99,7 +99,7 @@ typedef struct cst_cg_db_struct {
 
     /* Other parameters */
     int32_t do_mlpg;       /* implies deltas are in the model_vectors */
-    float *dynwin;
+    const float *dynwin;
     int32_t dynwinsize;
 
     float mlsa_alpha;

lang/vid_gb_ap/vid_gb_ap_cg.c

@@ -542,7 +542,7 @@ const float vid_gb_ap_model_range[] = {
    10.000000,
    5.163980,
 };
-float vid_gb_ap_dynwin[] = { -0.5, 0.0, 0.5 };
+const float vid_gb_ap_dynwin[] = { -0.5, 0.0, 0.5 };
 #define vid_gb_ap_dynwinsize 3
 const double vid_gb_ap_me_filter_0[] = {
 0.000000, 0.000007, 0.000026, 0.000049, 0.000065, 0.000062, 0.000028, -0.000052, -0.000189, -0.000393, -0.000670, -0.001020, -0.001439, -0.001914, -0.002426, -0.002948, -0.003448, -0.003883, -0.004211, -0.004381, -0.004344, -0.004051, -0.003453, -0.002511, -0.001190, 0.000535, 0.002674, 0.005227, 0.008178, 0.011497, 0.015138, 0.019040, 0.023132, 0.027330, 0.031542, 0.035670, 0.039614, 0.043274, 0.046556, 0.049373, 0.051649, 0.053321, 0.054344, 0.054688, 0.054344, 0.053321, 0.051649