Ninja: Fix RC language depfile generation with cmcldeps

In commit v3.7.0-rc1~275^2 (Ninja: Use full path for all source files,
2016-08-05), the source path was changed to use an absolute path.
Inside of `cmcldeps` for `.rc` file compilation, it uses a separate
argument for the path to the source file.  This ended up causing
`cmcldeps` to transform the following call:

    cmcldeps.exe RC source.rc ... C:/full/path/to/source.rc

into:

    ... C:/full/path/to//Tc source.rc

which is invalid.  Update the source filename to use the full path to
the source file so that the path is replaced properly.

Source/cmNinjaTargetGenerator.cxx

@@ -427,7 +427,7 @@ void cmNinjaTargetGenerator::WriteCompileRule(const std::string& lang)
         : mf->GetSafeDefinition("CMAKE_CXX_COMPILER");
       cldeps = "\"";
       cldeps += cmSystemTools::GetCMClDepsCommand();
-      cldeps += "\" " + lang + " $in \"$DEP_FILE\" $out \"";
+      cldeps += "\" " + lang + " " + vars.Source + " \"$DEP_FILE\" $out \"";
       cldeps += mf->GetSafeDefinition("CMAKE_CL_SHOWINCLUDES_PREFIX");
       cldeps += "\" \"" + cl + "\" ";
     }