CPP: Add another test case based on a real world case.

Author: geoffw0

cpp/ql/test/query-tests/Likely Bugs/Leap Year/Adding365DaysPerYear/Adding365daysPerYear.expected

@@ -1,2 +1,5 @@
 | test.cpp:173:29:173:38 | qwLongTime | This arithmetic operation $@ uses a constant value of 365 ends up modifying the date/time located at $@, without considering leap year scenarios. | test.cpp:170:2:170:47 | ... += ... | ... += ... | test.cpp:173:29:173:38 | qwLongTime | qwLongTime |
 | test.cpp:174:30:174:39 | qwLongTime | This arithmetic operation $@ uses a constant value of 365 ends up modifying the date/time located at $@, without considering leap year scenarios. | test.cpp:170:2:170:47 | ... += ... | ... += ... | test.cpp:174:30:174:39 | qwLongTime | qwLongTime |
+| test.cpp:193:15:193:18 | days | This arithmetic operation $@ uses a constant value of 365 ends up modifying the date/time located at $@, without considering leap year scenarios. | test.cpp:193:15:193:18 | days | days | test.cpp:193:15:193:18 | days | days |
+| test.cpp:193:15:193:24 | ... / ... | This arithmetic operation $@ uses a constant value of 365 ends up modifying the date/time located at $@, without considering leap year scenarios. | test.cpp:193:15:193:24 | ... / ... | ... / ... | test.cpp:193:15:193:24 | ... / ... | ... / ... |
+| test.cpp:193:22:193:24 | 365 | This arithmetic operation $@ uses a constant value of 365 ends up modifying the date/time located at $@, without considering leap year scenarios. | test.cpp:193:22:193:24 | 365 | 365 | test.cpp:193:22:193:24 | 365 | 365 |

cpp/ql/test/query-tests/Likely Bugs/Leap Year/Adding365DaysPerYear/test.cpp

@@ -176,3 +176,24 @@ void antipattern2()
 	// convert back to SYSTEMTIME for display or other usage
 	FileTimeToSystemTime(&ft, &st);
 }
+
+time_t mktime(struct tm *timeptr);
+struct tm *gmtime(const time_t *timer);
+
+time_t mkTime(int days)
+{
+	struct tm tm;
+	time_t t;
+
+	tm.tm_sec = 0;
+	tm.tm_min = 0;
+	tm.tm_hour = 0;
+	tm.tm_mday = 0;
+	tm.tm_mon = 0;
+	tm.tm_year = days / 365; // BAD
+	// ...
+
+	t = mktime(&tm); // convert tm -> time_t
+
+	return t;
+}