qt5/qtwebsocket: remove GPLv2 license

This module loose his GPLv2 licensing option. Remains the LGPLv2.1 with
exception and LGPLv3 as the possible open-source licenses.

Fixes:
http://autobuild.buildroot.net/results/6c80ba0669a7fc8cc60baaa849044fd65a78ce87/
Signed-off-by: Julien Corjon <corjon.j@ecagroup.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qt5/qt5websockets/qt5websockets.mk

@@ -11,10 +11,8 @@ QT5WEBSOCKETS_DEPENDENCIES = qt5base
 QT5WEBSOCKETS_INSTALL_STAGING = YES
 
 ifeq ($(BR2_PACKAGE_QT5BASE_LICENSE_APPROVED),y)
-QT5WEBSOCKETS_LICENSE = LGPLv2.1 with exception or LGPLv3 or GPLv2
-# Source files contain references to LGPL_EXCEPTION.txt but it is not included
-# in the archive.
-QT5WEBSOCKETS_LICENSE_FILES = LICENSE.LGPLv21 LICENSE.LGPLv3 LICENSE.GPLv2
+QT5WEBSOCKETS_LICENSE = LGPLv2.1 with exception or LGPLv3
+QT5WEBSOCKETS_LICENSE_FILES = LICENSE.LGPLv21 LGPL_EXCEPTION.txt LICENSE.LGPLv3
 else
 QT5WEBSOCKETS_LICENSE = Commercial license
 QT5WEBSOCKETS_REDISTRIBUTE = NO