qwt: fix qt5 opengl support

Qt5base BR2_PACKAGE_QT5BASE_OPENGL_LIB depends on BR2_PACKAGE_QT5BASE_OPENGL (see
package/qt5/qt5base/Config.in), so select it.

Fixes [1]:

  cp: cannot stat '.../output/host/usr/sh4-buildroot-linux-uclibc/sysroot/usr/lib/libQt5OpenGL.so.*': No such file or directory

[1] http://autobuild.buildroot.net/results/262/2623d48194b778c92134f9bceea923749b26ac6b

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qwt/Config.in

@@ -30,6 +30,7 @@ config BR2_PACKAGE_QWT_OPENGL
 	depends on (BR2_PACKAGE_HAS_LIBGLES && BR2_PACKAGE_HAS_LIBEGL && BR2_PACKAGE_QT) || \
 		(BR2_PACKAGE_QT5_GL_AVAILABLE && BR2_PACKAGE_QT5)
 	select BR2_PACKAGE_QT_OPENGL if BR2_PACKAGE_QT
+	select BR2_PACKAGE_QT5BASE_OPENGL if BR2_PACKAGE_QT5
 	select BR2_PACKAGE_QT5BASE_OPENGL_LIB if BR2_PACKAGE_QT5
 
 endif