Use higher resolution timestamps on Windows.
Use higher resolution timestamps on Windows.

In commit 886884ab606def1183d99eca7dec8affefee635e, the custom log
function in the example applications has already been modified to use
high resolution timestamps. But I forgot about the built-in default log
function. So this is basically the same change, but now applied to the
built-in log function.

glance-/libdivecomputer,henrik242/libdivecomputer,venkateshshukla/libdivecomputer,henrik242/libdivecomputer,venkateshshukla/libdivecomputer,Poltsi/libdivecomputer-vms,josh-wambua/libdivecomputer,josh-wambua/libdivecomputer,glance-/libdivecomputer