fix: advertise current_date and current_timestamp (#136)

- advertise CURRENT_DATE as DATETIME and SQL92-DATETIME available fn.
- advertise CURRENT_DATETIME as SQL92 DATETIME available function.

(cherry picked from commit a7c2274)

Author: bpintea

driver/defs.h

@@ -282,7 +282,8 @@
 	SQL_FN_TD_DAYOFYEAR | SQL_FN_TD_EXTRACT | SQL_FN_TD_HOUR | \
 	SQL_FN_TD_MINUTE | SQL_FN_TD_MONTH | SQL_FN_TD_MONTHNAME | \
 	SQL_FN_TD_QUARTER | SQL_FN_TD_SECOND | SQL_FN_TD_WEEK | \
-	SQL_FN_TD_YEAR | SQL_FN_TD_NOW | SQL_FN_TD_CURRENT_TIMESTAMP )
+	SQL_FN_TD_YEAR | SQL_FN_TD_NOW | SQL_FN_TD_CURRENT_TIMESTAMP | \
+	SQL_FN_TD_CURDATE | SQL_FN_TD_CURRENT_DATE )
 
 /*
  * TIMESTAMPDIFF timestamp intervals:
@@ -340,10 +341,11 @@
 #define ESODBC_SQL92_NUMERIC_VALUE_FUNCTIONS	0LU
 /*
  * SQL92 datetime functions:
- * - supported: none.
- * - not supported: CURRENT_DATE, CURRENT_TIME, CURRENT_DATETIME
+ * - supported: CURRENT_DATE, CURRENT_DATETIME.
+ * - not supported: CURRENT_TIME
  */
-#define ESODBC_SQL92_DATETIME_FUNCTIONS			0LU
+#define ESODBC_SQL92_DATETIME_FUNCTIONS			(0LU | \
+	SQL_SDF_CURRENT_DATE | SQL_SDF_CURRENT_TIMESTAMP )
 /*
  * SQL92 datetime literals support:
  * - supported: TIMESTAMP, INTERVAL: YEAR/MONTH/DAY/HOUR/MINUTE/SECOND/