Disable date object related system calls by default

Use DATE_SYS_CALLS=ON for make target to enable the
date related system calls. Also fix some minor issues.
Related issue: #923

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

jerry-core/CMakeLists.txt

@@ -185,6 +185,11 @@ project (JerryCore C ASM)
    set(DEFINES_JERRY ${DEFINES_JERRY} JERRY_ENABLE_LOG)
   endif()
 
+ # Date system calls
+  if("${ENABLE_DATE_SYS_CALLS}" STREQUAL "ON")
+   set(DEFINES_JERRY ${DEFINES_JERRY} JERRY_ENABLE_DATE_SYS_CALLS)
+  endif()
+
 # Platform-specific configuration
  set(DEFINES_JERRY ${DEFINES_JERRY} ${DEFINES_JERRY_${PLATFORM_EXT}})