qt: fix webkit dependencies

fix:
http://autobuild.buildroot.net/results/ce8/ce89ad1ca6aec9f7bb5549301bf4c0dcba9e0e37/

qtwebkit includes qscript headers.
For packages like python-pyqt if webkit is available but not qscript, the
compilation fails with :
buildroot/output/build/python-pyqt-4.11.3/sip/QtWebKit/qwebframe.sip:79:0:
../../../host/usr/i686-buildroot-linux-gnu/sysroot/usr/include/QtWebKit/qwebframe.h:28:36:
	fatal error: QtScript/qscriptengine.h: No such file or directory

This problem is not seen with Qt compilation because some relative include
directly from sources are added.

[Peter: also adjust comment]
Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt/Config.in

@@ -417,6 +417,7 @@ config BR2_PACKAGE_QT_ARCH_SUPPORTS_WEBKIT
 
 config BR2_PACKAGE_QT_WEBKIT
 	bool "WebKit Module"
+	depends on BR2_PACKAGE_QT_SCRIPT
 	depends on BR2_PACKAGE_QT_SHARED
 	depends on BR2_PACKAGE_QT_GUI_MODULE
 	depends on BR2_PACKAGE_QT_NETWORK
@@ -426,8 +427,9 @@ config BR2_PACKAGE_QT_WEBKIT
 	  Build the WebKit module.
 	  If unsure, say n.
 
-comment "WebKit needs shared library/NPTL toolchain/gui/network support"
-	depends on !(BR2_PACKAGE_QT_SHARED && BR2_PACKAGE_QT_GUI_MODULE && BR2_PACKAGE_QT_NETWORK)
+comment "WebKit needs shared library/NPTL toolchain/script/gui/network support"
+	depends on !(BR2_PACKAGE_QT_SCRIPT && BR2_PACKAGE_QT_SHARED && \
+		BR2_PACKAGE_QT_GUI_MODULE && BR2_PACKAGE_QT_NETWORK)
 	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL
 	depends on BR2_PACKAGE_QT_ARCH_SUPPORTS_WEBKIT