package/qt5: bump packages to latest 5.15 kde submodule version

Bump qt5 packages to latest submodule versions from
https://invent.kde.org/qt/qt/qt5/-/tree/kde/5.15

qtbase repo is a few commits after a tag named v5.15.18-lts-lgpl so
assume it's now 5.15.18.

qt5base patches are updated to make them apply silently and cleanly.

For qt5webengine-chromium:
- 0001-Add-python3-build-support.patc is removed as commit 68302c9ea158
  ("Enable building with Python 3") contains similar changes,
- 0004-Migrate-presubmit-to-python3.patch is only partially kept as
  commit 68302c9ea158 ("Enable building with Python 3") contains similar
  changes,
- 0006-Fix-build-in-Python-3.11-invalid-mode-rU.patch is only partially
  kept as commit 68302c9ea158 ("Enable building with Python 3") contains
  similar changes,
- 0007-Replace-imp.load_source-with-importlib-equivalent.patch is
  removed as commit 68302c9ea158 ("Enable building with Python 3")
  contains similar changes,
- 0010-Fix-building-with-system-libxml2.patch is removed as commit
  c98d28f2f0f2 ("Fix building with system libxml2") contains similar
  changes,
- 0012-Include-cstdint-for-uintptr_t-uint8_t-etc.patch is renamed
  0009-Include-cstdint-for-uintptr_t-uint8_t-etc.patch and contains more
  file patching to make qt5webengine build again,

Also make sure that the patches that have an upstream reference use the
proper Upstream: tag, so we can remove them from checkpackageignore.

For qt5webengine:
- 0002-Add-python3-build-support.patch is removed as commit 2294cc4ed5fd
  ("Add option to chose python version for building 5.15 WebEngine")
  contains similar changes. It now supports both Python2 and Python3 and
  defaults to Python2 if found first. This can be overridden with
  -webengine-python-version python3 in QT5WEBENGINE_CONF_OPTS but this
  was unnecessary in my tests as Python3 was properly selected from
  $(HOST_DIR)/bin/.

qt5webengine-chromium is updated with qt5webengine following the logic
stated in Buildroot commit c53455ea4f
("package/qt5/qt5webengine-chromium: bump version after qtwebengine
bump").

I am unsure whether qt5webengine-chromium-catapult also requires an
update.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
[Arnout: fix Upstream: tags]
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

.checkpackageignore

@@ -794,11 +794,7 @@ package/qextserialport/0001-Create-a-main-include-file-QExtSerialPort.patch lib_
 package/qextserialport/0002-Tell-qmake-to-add-a-pkgconfig-file-to-ease-usage-wit.patch lib_patch.Upstream
 package/qt5/qt5base/0001-qtbase-Fix-build-error-when-using-EGL.patch lib_patch.Upstream
 package/qt5/qt5base/0002-double-conversion-enable-for-microblaze.patch lib_patch.Upstream
-package/qt5/qt5base/0003-double-conversion-enable-for-nios2.patch lib_patch.Upstream
-package/qt5/qt5base/0004-double-conversion-enable-for-xtensa.patch lib_patch.Upstream
 package/qt5/qt5base/0005-eglfs-avoid-breaking-compilation-for-obscure-EGLNativeDisplayType-types.patch lib_patch.Upstream
-package/qt5/qt5base/0006-Fix-build-on-riscv32.patch lib_patch.Upstream
-package/qt5/qt5base/0007-src-corelib-configure.json-fix-atomicfptr-detection.patch lib_patch.Upstream
 package/qt5/qt5base/0008-eglconvenience-add-missing-QList-include.patch lib_patch.Upstream
 package/qt5/qt5declarative/0001-qsgtexture-fix-debug-build-with-uclibc.patch lib_patch.Upstream
 package/qt5/qt5declarative/0002-qv4regexp_p-needs-c-limits-include-instead-of-plain-.patch lib_patch.Upstream
@@ -806,10 +802,8 @@ package/qt5/qt5enginio/0001-Do-not-use-deprecated-QLinkedList.patch lib_patch.Up
 package/qt5/qt5location/0001-3rdparty-mapbox-gl-native-fix-musl-compile-pthread_g.patch lib_patch.Upstream
 package/qt5/qt5script/0001-Detect-32-bits-armv8-a-architecture.patch lib_patch.Upstream
 package/qt5/qt5tools/0001-Disable-designer-tool-fixes-configure-error.patch lib_patch.Upstream
-package/qt5/qt5webengine-chromium/0001-Add-python3-build-support.patch lib_patch.Upstream
-package/qt5/qt5webengine-chromium/0002-Don-t-rebase-sysroot-path.patch lib_patch.Upstream
+package/qt5/qt5webengine-chromium/0001-Don-t-rebase-sysroot-path.patch lib_patch.Upstream
 package/qt5/qt5webengine/0001-gn.pro-don-t-link-statically-with-libstc.patch lib_patch.Upstream
-package/qt5/qt5webengine/0002-Add-python3-build-support.patch lib_patch.Upstream
 package/qt5/qt5webkit/0001-WinCairo-PlayStation-ICU-68.1-no-longer-exposes-FALS.patch lib_patch.Upstream
 package/qt5/qt5webkit/0002-Fix-compilation-with-Python-3.9-avoid-passing-encodi.patch lib_patch.Upstream
 package/qt5/qt5webkit/0003-Let-Bison-generate-the-header-directly-to-fix-build-.patch lib_patch.Upstream