package/qt5base: fix libtool la file dependency_libs entries

package/qt5base: fix libtool la file dependency_libs entries

Fixes [1]:

  libtool: error: cannot find the library '' or unhandled argument '/.../host/riscv64-buildroot-linux-gnu/sysroot/usr/lib/libQt5Widgets.so'

Add upstream suggested patch ([2]) to change la file dependency_libs entries
to -L<path> -l<library> version.

[1] http://autobuild.buildroot.net/results/79c1e1b7a1bc53c1e9b2ae0c9acb443e6d2e2994
[2] https://codereview.qt-project.org/c/qt/qtbase/+/269146

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Tested-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>