Add the IDF_BUILD_VER_TAG variables to include the build system version
tag. These variables can be used in files, such as CMake toolchain
files, which are shared between cmakev1 and cmakev2. This allows for the
inclusion of files from the currently running build system version. For
example:
include($ENV{IDF_PATH}/tools/cmake${IDF_BUILD_VER_TAG}/utilities.cmake).
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
71f5ee5bf6