[qtwebengine] Fix build, add features for pdf and webengine

[dg0yt]

Qt PDF can be built for static triplets. Except for windows: It doesn't allow to use system (vcpkg) libs.

[nickdademo]

Will this also fix #45200? :)

I am getting this error for windows-x64 and am using this port overlay as a fix: https://github.com/jblaisdev/vcpkg-qtwebengine-overlay

[dg0yt]

Will this also fix #45200? :)

No, I don't think so. I only test Linux ATM. The non-Window side of this port is quite different, with use of more vcpkg libs.

But this work started from a Windows issue blocking #46058. That error is probably from using vcpkg protobuf headers with a vendored protobuf, due to the order of include directories. protobuf is also in #45807.

Maybe the order of include directories is also relevant for other problems, such as #45200?

[dg0yt]

Absolute path in

\$<LINK_ONLY:\$<1:-Wl,--no-fatal-warnings \$<\$<CONFIG:Release>:@/[REDACTED]/vcpkg/buildtrees/qtwebengine/x64-linux-rel/src/pdf/Release/x86_64/QtPdf_ldir.rsp> \$<\$<CONFIG:Release>:@/[REDACTED]/vcpkg/buildtrees/qtwebengine/x64-linux-rel/src/pdf/Release/x86_64/QtPdf_libs.rsp> -Wl,--no-fatal-warnings>>

... a response file, seriously?

[dg0yt]

The first one only carries

 -L"/[REDACTED]/vcpkg/installed/x64-linux/lib"

but the second has

 -latomic -licuuc -licudata -lstdc++ -lm -lpthread -lpng16 -lz -lgmodule-2.0 -lgobject-2.0 -lffi -lgthread-2.0 -lglib-2.0 -lpcre2-8 -lopenjp2

[dg0yt]

Test ports. Discovered that pdfium wasn't using the system (vcpkg) libjpeg-turbo, resulting in duplicate symbols.

[dg0yt]

nodejs on arm64-osx:

CMake Error at ports/qtwebengine/portfile.cmake:138 (execute_process):
  execute_process failed command indexes:

    1: "Abnormal exit with child return code: Subprocess killed"

Call Stack (most recent call first):
  scripts/ports.cmake:206 (include)

'/Users/vcpkg/Data/installed/arm64-osx/tools/node/bin/node' '--version'

[dg0yt]

Suggested change

list(REMOVE_ITEM FEATURES "private-dependencies")

Left over, but I don't want to rebuild.