mingw compat

colours.c

@@ -1,9 +1,11 @@
 #include "colours.h"
 
 struct colour get_random_color(unsigned int seed) {
-    int red = rand_r(&seed) % 255;
-    int blue = rand_r(&seed) % 255;
-    int green = rand_r(&seed) % 255;
+    srand(seed);
+
+    int red = rand() % 255;
+    int blue = rand() % 255;
+    int green = rand() % 255;
 
     struct colour col;
     col.r = red;