checker: support integer and voidptr key types for maps (#7503)

vlib/hash/wyhash.c.v

@@ -3,9 +3,14 @@ module hash
 //#flag -I @VROOT/thirdparty/wyhash
 //#include "wyhash.h"
 fn C.wyhash(byteptr, u64, u64) u64
+fn C.wyhash64(u64, u64) u64
 
 [inline]
 pub fn wyhash_c(key byteptr, len u64, seed u64) u64 {
 	return C.wyhash(key, len, seed)
 }
 
+[inline]
+pub fn wyhash64_c(a u64, b u64) u64 {
+	return C.wyhash64(a, b)
+}