COMP: Remove vcl_time and vcl_clock

These vcl methods were initialliy use because not al systems provided
a consistent interface. Now, clock_t, time_t, clock() and time() are
well supported. The complex logic in the vcl interface is no longer
needed.

Change-Id: I40975e30605bde1db389b4c7bec342d9f7ae5405
Merge topic 'Remove_vcl_time_vcl_clock'

1f19aa00 COMP: Remove vcl_time and vcl_clock