Port native tools to use KF5_HOST_TOOLING

The previous hack of just copying the native tools into the target sysroot
has several limitations:
- it no longer works with relative RPATHs being used
- it fails in the case of kpackage where we need the same tools for host
  and target

classes/cmake_kf5.bbclass

@@ -1,10 +1,16 @@
 inherit cmake_qt5
 
-EXTRA_OECMAKE += " \
+EXTRA_OECMAKE_class-native += " \
     -DOE_KF5_PATH_HOST_ROOT=${STAGING_DIR_HOST} \
     -DBUILD_TESTING=OFF \
 "
 
+EXTRA_OECMAKE_class-target += " \
+    -DOE_KF5_PATH_HOST_ROOT=${STAGING_DIR_HOST} \
+    -DBUILD_TESTING=OFF \
+    -DKF5_HOST_TOOLING=${STAGING_DIR_NATIVE}/${libdir}/cmake \
+"
+
 DEPENDS += "extra-cmake-modules qttools-native"
 
 # don't bother with translations for host tools

classes/kauth.bbclass

@@ -0,0 +1,9 @@
+# Class for recipes using KAuth host tools
+
+DEPENDS += " \
+    kauth \
+    kauth-native \
+    polkit-qt-1 \
+"
+
+EXTRA_OECMAKE += " -DKF5_HOST_TOOLING=${STAGING_DIR_NATIVE}/${libdir}/cmake"

classes/kconfig.bbclass

@@ -0,0 +1,8 @@
+# Class for recipes using kconfig host tools
+
+DEPENDS += " \
+    kconfig \
+    kconfig-native \
+"
+
+EXTRA_OECMAKE += " -DKF5_HOST_TOOLING=${STAGING_DIR_NATIVE}/${libdir}/cmake"

classes/kcoreaddons.bbclass

@@ -0,0 +1,13 @@
+# Class for recipes using kcoreaddons host tools
+
+do_compile_prepend() {
+    # desktoptojson needs to find installed service type files
+    export XDG_DATA_DIRS=${STAGING_DATADIR}:$XDG_DATA_DIRS
+}
+
+DEPENDS += " \
+    kcoreaddons \
+    kcoreaddons-native \
+"
+
+EXTRA_OECMAKE += " -DKF5_HOST_TOOLING=${STAGING_DIR_NATIVE}/${libdir}/cmake"

classes/kdoctools.bbclass

@@ -3,8 +3,6 @@
 do_compile_prepend() {
     # meinproc5 needs to find installed service type files
     export XDG_DATA_DIRS=${STAGING_DATADIR}:$XDG_DATA_DIRS
-    # meinproc5 needs to find its libraries
-    export LD_LIBRARY_PATH=${STAGING_LIBDIR_NATIVE}:$LD_LIBRARY_PATH
 }
 
 DEPENDS += " \
@@ -13,3 +11,5 @@ DEPENDS += " \
     libxslt-native \
     karchive-native \
 "
+
+EXTRA_OECMAKE += " -DKF5_HOST_TOOLING=${STAGING_DIR_NATIVE}/${libdir}/cmake"