VS: Add -Zc:inline[-] flag table entry for v142

Apply the change from commit f1223e34c6 (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

Templates/MSBuild/FlagTables/v142_CL.json

@@ -858,6 +858,13 @@
     "value": "true",
     "flags": []
   },
+  {
+    "name": "RemoveUnreferencedCodeData",
+    "switch": "Zc:inline-",
+    "comment": "Remove unreferenced code and data",
+    "value": "false",
+    "flags": []
+  },
   {
     "name": "RemoveUnreferencedCodeData",
     "switch": "Zc:inline",