VS: Fix `/analyze:log` flag mapping for v142

Apply the change from commit 44dc9fc4 (VS: Fix /analyze:log flag
mapping, 2018-11-26) to the v142 flag table.

The `/analyze:log` argument requires a value in the following argument.
Also drop the general `/analyze:` flag table entry so that such flags
will be passed through as plain additional options.  This is necessary
because some such options have following values and some do not but
not all have `.vcxproj` elements to hold the values.