Apply the change from commit f1223e34 (VS: Add v140 flag table entries
for `-Zc:inline[-]`, 2018-11-26) to the v142 flag table.

The documentation of this option [1] claims that the default is off, but
VS seems to use `-Zc:inline` by default if `RemoveUnreferencedCodeData`
does not appear in the `.vcxproj` file.  Add the flag table entry to
allow use of the flag to be configured.

[1] https://msdn.microsoft.com/en-us/library/dn642448.aspx