cgen: fix x in [...]! operator with fixed arrays (fix #24082) (#24083)

Author: felipensp

vlib/v/gen/c/infix.v

@@ -823,6 +823,9 @@ fn (mut g Gen) infix_expr_in_optimization(left ast.Expr, left_type ast.Type, rig
 					g.expr(left)
 				}
 				g.write(' == ')
+				if elem_sym.kind == .array_fixed {
+					g.write('(${g.styp(right.elem_type)})')
+				}
 				g.expr(array_expr)
 			}
 		}

vlib/v/tests/in_op_array_fixed_test.v

@@ -0,0 +1,9 @@
+fn test_main() {
+	arr := [u8(1), 2, 3, 4]!
+	if arr != [4]u8{} || arr != [4]u8{init: 255} {
+		println('success')
+	}
+	if arr !in [[4]u8{}, [4]u8{init: 255}] {
+		println('success')
+	}
+}