Also added CONFIG_ARDUINO_IDF_BRANCH

Author: lbernstone

tools/prepare-libs.sh

@@ -131,7 +131,9 @@ rm platform_start.txt platform_mid.txt 1platform_mid.txt
 
 #sdkconfig
 IDF_COMMIT=$(git -C $IDF_PATH rev-parse --short HEAD)
+IDF_BRANCH=$(git -C $IDF_PATH symbolic-ref --short HEAD)
 echo #define CONFIG_ARDUINO_IDF_COMMIT "$IDF_COMMIT">> build/include/sdkconfig.h
+echo #define CONFIG_ARDUINO_IDF_BRANCH "$IDF_BRANCH">> build/include/sdkconfig.h
 mkdir -p $AR_SDK/include/config && cp -f build/include/sdkconfig.h $AR_SDK/include/config/sdkconfig.h
 cp -f sdkconfig $AR_SDK/sdkconfig