crypto.rand: cleanup test, make it less likely to fail in CI

vlib/builtin/int.v

@@ -364,16 +364,6 @@ pub fn (nn byteptr) str() string {
 
 // ----- utilities functions -----
 
-pub fn (a []byte) contains(val byte) bool {
-	for aa in a {
-		if aa == val {
-			return true
-		}
-	}
-	return false
-}
-
-
 /*
 pub fn (c rune) str() string {
 	fst_byte := int(c)>>8 * 3 & 0xff
@@ -413,3 +403,33 @@ pub fn (b []byte) clone() []byte {
 	return res
 }
 
+
+// TODO generic
+pub fn (a []byte) contains(val byte) bool {
+	for aa in a {
+		if aa == val {
+			return true
+		}
+	}
+	return false
+}
+
+// TODO generic
+fn (ar []int) contains(val int) bool {
+	for s in ar {
+		if s == val {
+			return true
+		}
+	}
+	return false
+}
+
+// TODO generic
+pub fn (a []u64) contains(val u64) bool {
+	for aa in a {
+		if aa == val {
+			return true
+		}
+	}
+	return false
+}

vlib/builtin/string.v

@@ -846,16 +846,6 @@ fn (ar []string) contains(val string) bool {
 	return false
 }
 
-// TODO generic
-fn (ar []int) contains(val int) bool {
-	for s in ar {
-		if s == val {
-			return true
-		}
-	}
-	return false
-}
-
 /*
 pub fn (a []string) to_c() voidptr {
 	mut res := malloc(sizeof(byteptr) * a.len)