Do not use webkit in case of static build.

Since linking against a statically build qtwebkit fails, fallback to
use QTextBrowser. I guess we need to fix static webkit builds first.

Change-Id: I1bc6c1ae70f0e57fa179a3ffe8750bde97809d12
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/assistant/assistant/assistant.pro

@@ -2,7 +2,7 @@ TEMPLATE = app
 LANGUAGE = C++
 TARGET = assistant
 DESTDIR = $$QT.help.bins
-qtHaveModule(webkitwidgets) {
+qtHaveModule(webkitwidgets):!contains(QT_CONFIG, static) {
     QT += webkitwidgets
 } else {
     DEFINES += QT_NO_WEBKIT
@@ -79,7 +79,7 @@ SOURCES += aboutdialog.cpp \
     openpageswidget.cpp \
     openpagesmanager.cpp \
     openpagesswitcher.cpp
-qtHaveModule(webkitwidgets) {
+qtHaveModule(webkitwidgets):!contains(QT_CONFIG, static) {
     SOURCES += helpviewer_qwv.cpp
 } else {
     SOURCES += helpviewer_qtb.cpp