quartus build fixes

hw/rtl/libs/VX_countones.v

@@ -2,18 +2,23 @@
 `include "VX_platform.vh"
 
 module VX_countones #(
-    parameter N = 10
+    parameter N = 10,
+    parameter N_BITS = $clog2(N+1)
 ) (
-    input wire [N-1:0]       valids,
-    output reg [$clog2(N):0] count    
+    input wire [N-1:0]  valids,
+    output wire [N_BITS-1:0] count    
 );
+    reg [N_BITS-1:0] count_r;
+
     always @(*) begin
-        count = 0;
+        count_r = 0;
         for (integer i = N-1; i >= 0; i = i - 1) begin
             if (valids[i]) begin
-                count = count + 1;
+                count_r = count_r + N_BITS'(1);
             end
         end
     end
 
+    assign count = count_r;
+
 endmodule