Fix qbs build

Include MsvcToolchain unconditionally, as in the CMake build.

Change-Id: I01c9642ee74bb8f4476ba318512f4f441a823b93
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/projectexplorer/projectexplorer.qbs

@@ -89,6 +89,7 @@ QtcPlugin {
             "makestep.cpp", "makestep.h",
             "miniprojecttargetselector.cpp", "miniprojecttargetselector.h",
             "msvcparser.cpp", "msvcparser.h",
+            "msvctoolchain.cpp", "msvctoolchain.h",
             "namedwidget.cpp", "namedwidget.h",
             "osparser.cpp", "osparser.h",
             "panelswidget.cpp", "panelswidget.h",
@@ -230,15 +231,6 @@ QtcPlugin {
         files: ["*.png"]
     }
 
-    Group {
-        name: "WindowsToolChains"
-        condition: qbs.targetOS.contains("windows") || qtc.withPluginTests
-        files: [
-            "msvctoolchain.cpp",
-            "msvctoolchain.h",
-        ]
-    }
-
     QtcTestFiles {
         files: ["outputparser_test.h", "outputparser_test.cpp"]
     }