qtwebengine: inherit pkgconfig
qtwebengine: inherit pkgconfig

* Newer oe-core doesn't pull many default dependencies anymore:
  https://lists.openembedded.org/g/openembedded-core/message/156185
  add explicit dependency on pkgconfig through pkgconfig.bbclass as
  we're using it here.

* fixes:
  | sed: can't read /OE/build/luneos-honister/webos-ports/tmp-glibc/work/core2-64-webos-linux/qtwebengine/5.15.4+gitAUTOINC+dd7f7a9166_7aad021f2e-r0/image/usr/lib/pkgconfig/Qt5WebEngineCore.pc: No such file or directory
  because without pkgconfig detected this file isn't created during
  the build

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

meta-qt5/meta-qt5,meta-qt5/meta-qt5