v2: fix tests - gen output

vlib/v/gen/cgen.v

@@ -41,7 +41,7 @@ pub fn (g mut Gen) init() {
 	g.definitions.writeln(c_headers)
 	g.write_sorted_types()
 	g.write_multi_return_types()
-	g.definitions.writeln('// end of definitions')
+	g.definitions.writeln('// end of definitions #endif')
 }
 
 pub fn (g mut Gen) write_multi_return_types() {

vlib/v/gen/tests/1.c

@@ -14,7 +14,7 @@ typedef struct {
 	int arg0;
 	string arg1;
 } multi_return_int_string;
-// end of definitions
+// end of definitions #endif
 void foo(int a);
 void User_inc_age(User u, int n);
 int get_int(string a);

vlib/v/gen/tests/2.c

@@ -3,7 +3,7 @@ struct User {
 };
 
 // multi return structs
-// end of definitions
+// end of definitions #endif
 int function1();
 void foo(int a);
 void init_user();

vlib/v/gen/tests/3.c

@@ -4,7 +4,7 @@ struct User {
 };
 
 // multi return structs
-// end of definitions
+// end of definitions #endif
 int main() {
 	User user = (User){
 };

vlib/v/gen/tests/4.c

@@ -13,7 +13,7 @@ typedef struct {
 	string arg1;
 } multi_return_int_string;
 
-// end of definitions
+// end of definitions #endif
 multi_return_int_string mr_test();
 int testa();
 string testb(int a);