Fix system call related date builtin functions

Related issues: #213, #691
 * Fixed 'ecma_date_local_tza' and 'ecma_date_daylight_saving_ta' date builtin helper functions
 * Added syscall of gettimeofday function to get the current system time and timezone.
 * Fixed related regression test files.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

jerry-libc/include/time.h

@@ -0,0 +1,46 @@
+/* Copyright 2016 Samsung Electronics Co., Ltd.
+ * Copyright 2016 University of Szeged
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JERRY_LIBC_TIME_H
+#define JERRY_LIBC_TIME_H
+
+#ifdef __cplusplus
+# define EXTERN_C "C"
+#else /* !__cplusplus */
+# define EXTERN_C
+#endif /* !__cplusplus */
+
+/**
+ * Time value structure
+ */
+struct _timeval
+{
+  unsigned long tv_sec;   /**< seconds */
+  unsigned long tv_usec;  /**< microseconds */
+};
+
+/**
+ * Timezone structure
+ */
+struct timezone
+{
+  int tz_minuteswest;     /**< minutes west of Greenwich */
+  int tz_dsttime;         /**< type of DST correction */
+};
+
+extern EXTERN_C int gettimeofday (void *tp, void *tzp);
+
+#endif /* !JERRY_LIBC_TIME_H */