Changed X_global.h file to lower case file name

When creating a new shared library project, the wizard generates next
to its class header and source files, also a _global.h file where the import
& export definitions happens. This _global.h file is always created with upper
case characters if you give your class name upper case chars...

example -> MyLib_global.h

Change-Id: Ic0ae2b740682f624b4c00cc1c7c40a29e08f554f
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/qt4projectmanager/wizards/librarywizard.cpp

@@ -99,7 +99,7 @@ Core::GeneratedFiles LibraryWizard::generateFiles(const QWizard *w,
     // Create files: global header for shared libs
     QString globalHeaderFileName;
     if (projectParams.type == QtProjectParameters::SharedLibrary) {
-        const QString globalHeaderName = buildFileName(projectPath, projectParams.fileName + QLatin1String(sharedHeaderPostfixC), headerSuffix());
+        const QString globalHeaderName = buildFileName(projectPath, projectParams.fileName.toLower() + QLatin1String(sharedHeaderPostfixC), headerSuffix());
         Core::GeneratedFile globalHeader(globalHeaderName);
         globalHeaderFileName = QFileInfo(globalHeader.path()).fileName();
         globalHeader.setContents(CppTools::AbstractEditorSupport::licenseTemplate(globalHeaderFileName)