[oe] [meta-qt5][PATCH][master][morty]] populate_sdk_qt5: use _append operator

[Max Krummenacher]

populate_sdk assigns TOOLCHAIN_HOST_TASK and TOOLCHAIN_TARGET_TASK with ?=.
Thus depending on the order in which populate_sdk and populate_sdk-qt5 get
parsed the assignments from populate_sdk are discarded and the resulting sdk
is missing among others the environment-setup script.

Signed-off-by: Max Krummenacher <max.krummenacher at toradex.com>
---
 classes/populate_sdk_qt5.bbclass | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/classes/populate_sdk_qt5.bbclass b/classes/populate_sdk_qt5.bbclass
index bbf137d..a10341d 100644
--- a/classes/populate_sdk_qt5.bbclass
+++ b/classes/populate_sdk_qt5.bbclass
@@ -2,7 +2,7 @@
 
 inherit populate_sdk_qt5_base
 
-TOOLCHAIN_HOST_TASK += "nativesdk-packagegroup-qt5-toolchain-host"
-TOOLCHAIN_TARGET_TASK += "packagegroup-qt5-toolchain-target"
+TOOLCHAIN_HOST_TASK_append = " nativesdk-packagegroup-qt5-toolchain-host"
+TOOLCHAIN_TARGET_TASK_append = " packagegroup-qt5-toolchain-target"
 
 FEATURE_PACKAGES_qtcreator-debug = "packagegroup-qt5-qtcreator-debug"
-- 
2.5.5