qtbase: Compile qtbase 5.10 without support for getentropy which would otherwise produce binaries incompatible with our usual 3.10 kernels and result in ultra odd errors (no such file or directory, error -1) when linking with qtbase

Remove Mesa 10.3.7 whose LLVMPipe is not compatible with OE Rocko's new LLVM version. Prepare a switch from VBox+VBoxGuestAdditions to QEMU+VirGL3D

qtbase: Give a default variable to QT_IM_MODULE to workaround the Agenda app staying blank under certain conditions

qtbase: respect ld-is-gold DISTRO_FEATURES (do it here before https://patches.openembedded.org/patch/140727/ gets upstreamed in meta-qt5)

qtbase: enable the glib loop which is needed for example by mlite for DConf watch features (used via nemo-qml-plugin-configuration)

qtbase: enables accessibility which is needed by QtQuick, icu which is needed by QtWebKit and sql-sqlite which is needed by lipstick

qtbase: Forces GLES2 usage because of this issue: https://bugreports.qt.io/browse/QTBUG-46831 it will be solved on Qt 5.6