CPP: Detect Microsoft compilations somewhat more reliably.

cpp/ql/src/semmle/code/cpp/File.qll

@@ -302,7 +302,10 @@ class File extends Container, @file {
   predicate compiledAsMicrosoft() {
     exists(Compilation c |
       c.getAFileCompiled() = this and
-      c.getAnArgument() = "--microsoft"
+      (
+        c.getAnArgument() = "--microsoft" or
+        c.getAnArgument().matches("%\\\\cl.exe")
+      )
     )
   }