buildroot

qt5: bump latest version to 5.10.1

The tarball filename has changed since 5.10. The module suffix
*opensource-src* has changed to *everywhere-src*. I introduced the
*QT5_SOURCE_TARBALL_PREFIX* variable to set the right filename according
to the Qt version.

qtwebengine:

	Select libnss. It is a requirement[1] because OpenSSL
	certificate validation[2] and NSS bundle[3] was dropped.

	Add host-libnss and host-libpng to satisfy new requirement to
	build an internal host-tool.

	Set ninja host pkg-config tool using environment variable
	$GN_PKG_CONFIG_HOST[4]. The build system uses pkg-config to get
	package data for both host and target architectures. Using the
	same call to pkg-config for both target and host leads to build
	mismatches: it tries to link a host-tool using target libraries.

qt5base:

	sqlite plugin now uses sqlite3_column_table_name16() so select
	BR2_PACKAGE_SQLITE_ENABLE_COLUMN_METADATA to make sure it is
	available.

qt5multimedia:

	libqgsttools was renamed to libQtMultimediaGstTools. The latter
	name matches the libQt5Multimedia*.so.* pattern so no additional
	copy command is needed for it anymore.

qt5xmlpatterns:

	Names of the license files have changed: LICENSE.(L)GPLv3 ->
	LICENSE.(L)GPL3. The new files in fact already existed in 5.9.4
	but the old ones were not removed yet. The new files are
	slightly different: there used to be a Qt header in front of it
	which is now removed. Also LICENSE.LGPL3 is rewrapped.

qt5location, qt5quickcontrols, qt5serialport:

	Same license files issue, and for LICENSE.GPLv2 as well.
	LICENSE.GPL2 has the "How to Apply These Terms to Your New
	Programs" text appended to it.

qt5script:

	Similar license file issues, but the new license files were not
	present yet. LICENSE.GPLv21 was removed so there is no longer a
	license file for the LGPL-2.1-covered Qt code.

[1]: https://github.com/qt/qtwebengine/commit/9b449045fbd5fd3b58bcaff6cf0c5878cd6e64eb
[2]: https://codereview.chromium.org/2862543003
[3]: https://codereview.chromium.org/1882433002
[4]: https://github.com/qt/qtwebengine/blob/v5.10.1/src/core/config/linux.pri#L111-L125

Signed-off-by: Gaël PORTAY <gael.portay@savoirfairelinux.com>
[Peter:
 - fix sqlite plugin support in qt5base;
 - fix target installation of qt5multimedia
]
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
[Arnout:
 - create a local host-pkg-config tool instead of extending pkgconf;
 - pass the same options to host-pkg-config as we do for other packages;
 - carry the EGL mesa3d X11 headers patch;
 - update license file names and hashes
]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>