fix: wasm32 size_t is 32-bit so we need to fix the definition of RNG_MAX

Author: ntamas

src/_igraph/random.c

@@ -44,7 +44,12 @@ typedef struct {
 } igraph_i_rng_Python_state_t;
 
 #define RNG_BITS 32
-#define RNG_MAX ((((size_t) 1) << RNG_BITS) - 1)
+#ifdef __wasm32__
+  /* size_t is 32-bit on wasm32 so we cannot use the shift trick */
+  #define RNG_MAX 0xFFFFFFFF
+#else
+  #define RNG_MAX ((((size_t) 1) << RNG_BITS) - 1)
+#endif
 
 static igraph_i_rng_Python_state_t igraph_rng_Python_state = {0};
 static igraph_rng_t igraph_rng_Python = {