CMSIS-DSP: Temporary fix for the spline function.

The spline function was preventing the Python wrapper from
being built on windows.
It is a temporary fix. The spline function will have to be reworked.

Source/SupportFunctions/arm_spline_interp_f32.c

@@ -149,6 +149,14 @@
  * @param[in]  blockSize  number of samples of output data.
  */
 
+/* 
+
+Temporary fix because some arrays are defined on the stack.
+They should be passed as additional arguments to the function.
+
+*/
+#define MAX_DATA_POINTS 40
+
 void arm_spline_f32(
         arm_spline_instance_f32 * S, 
   const float32_t * x,
@@ -157,6 +165,7 @@ void arm_spline_f32(
         float32_t * pDst,
 	uint32_t blockSize)
 {
+
     /* 
 
     As explained in arm_spline_interp_init_f32.c, this must be > 1
@@ -167,8 +176,13 @@ void arm_spline_f32(
 
     float32_t hi, hm1;
 
-    /* Temporary variables for system AX=B */
+    /* 
-    float32_t u[n-1], z[n], c[n];
+
+    Temporary variables for system AX=B.
+    This will be replaced by new arguments for the function.
+
+     */
+    float32_t u[MAX_DATA_POINTS], z[MAX_DATA_POINTS], c[MAX_DATA_POINTS];
     float32_t Bi, li;
 
     float32_t bi, di;
@@ -348,7 +362,8 @@ void arm_spline_f32(
  
         pDst++; 
         blkCnt2--;   
-    }                                                           
+    }   
+                                                       
 }
 
 /**