McuSupport: Add support for creating FreeRTOS kits

Besides Baremetal, Qt for MCUs also supports FreeRTOS for a few targets.
This change:

- shows the FreeRTOS source path chooser
- set the FreeRTOS source path as kit environment variable
- sets OS=FreeRTOS in the kit CMake configuration and kit meta data

Task-number: QTCREATORBUG-23938
Change-Id: I69cbd4f9b6b4a842788a8dad57905ef517b8b1d5
Reviewed-by: Rainer Keller <Rainer.Keller@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/plugins/mcusupport/mcusupportconstants.h b/src/plugins/mcusupport/mcusupportconstants.h
index 30d28f44df..3d223f4809 100644
--- a/src/plugins/mcusupport/mcusupportconstants.h
+++ b/src/plugins/mcusupport/mcusupportconstants.h
@@ -38,6 +38,7 @@ const char KIT_MCUTARGET_MODEL_KEY[] = "McuSupport.McuTargetModel";
 const char KIT_MCUTARGET_SDKVERSION_KEY[] = "McuSupport.McuTargetSdkVersion";
 const char KIT_MCUTARGET_KITVERSION_KEY[] = "McuSupport.McuTargetKitVersion";
 const char KIT_MCUTARGET_COLORDEPTH_KEY[] = "McuSupport.McuTargetColorDepth";
+const char KIT_MCUTARGET_OS_KEY[] = "McuSupport.McuTargetOs";
 
 const char SETTINGS_GROUP[] = "McuSupport";
 const char SETTINGS_KEY_PACKAGE_PREFIX[] = "Package_";