hyperion: find Qt5 cmake configs in staging area and addon (2)

Qt5 is built with -sysroot removed and installs entirely under its own
staging prefix rather than into the sysroot. The default cmake toolchain
file sets CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY, so cmake cannot find
Qt5's config files outside CMAKE_FIND_ROOT_PATH.

Generate a thin wrapper toolchain file that includes the real LE toolchain
and appends Qt5's staging prefix to CMAKE_FIND_ROOT_PATH. Pass this via
PKG_CMAKE_OPTS_TARGET so it overrides the default toolchain file.

Author: heitbaum

packages/addons/service/hyperion/package.mk

@@ -5,7 +5,7 @@ PKG_NAME="hyperion"
 PKG_VERSION="fb413cd7e8825ffc26925013f57ac93a774f12bc"
 PKG_SHA256="fafa4eeddacb15a8fd96b0e69fac400faa735c6e1ccd78673c9d96b0ac84d7a3"
 PKG_VERSION_DATE="2019-08-19"
-PKG_REV="1"
+PKG_REV="2"
 PKG_ARCH="any"
 PKG_LICENSE="MIT"
 PKG_SITE="https://github.com/hyperion-project/hyperion"
@@ -53,6 +53,12 @@ pre_build_target() {
 
 pre_configure_target() {
   echo "" >../cmake/FindGitVersion.cmake
+
+  cat > "${PKG_BUILD}/toolchain-qt5.cmake" <<EOF
+include("${CMAKE_CONF}")
+list(APPEND CMAKE_FIND_ROOT_PATH "$(get_install_dir qt5)/usr")
+EOF
+  PKG_CMAKE_OPTS_TARGET+=" -DCMAKE_TOOLCHAIN_FILE=${PKG_BUILD}/toolchain-qt5.cmake"
 }
 
 addon() {