Add missing colon for win msvc scope

Bug in change 9795976a

Task-number: QTCREATORBUG-12770
Change-Id: I6034f7df9ef1159f0ce39d2784bda2755fefd829
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/qmakeprojectmanager/librarydetailscontroller.cpp

@@ -597,7 +597,7 @@ static QString generatePreTargetDepsSnippet(AddLibraryWizard::Platforms platform
             generatedPlatforms |= windowsPlatforms;
         } else {
             if (windowsPlatforms & AddLibraryWizard::WindowsMSVCPlatform) {
-                str << "win32:!win32-g++ " << preTargetDepsSnippet << libName << ".lib\n";
+                str << "win32:!win32-g++: " << preTargetDepsSnippet << libName << ".lib\n";
                 generatedPlatforms |= AddLibraryWizard::WindowsMSVCPlatform; // mingw will be handled with common scopes
             }
             // mingw not generated yet, will be joined with unix like