build: export GIT_CEILING_DIRECTORIES for package builds #12710
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A package may run git as part of its build process, and if the package source code is not from a git checkout, then git may traverse up the directory tree to find buildroot's repository directory (.git).
For instance, Poetry Core, a Python build backend, will read the contents of .gitignore for paths to exclude when creating a Python package. If it finds buildroot's .gitignore file, then Poetry Core will exclude all of the package's files.
This exports
GIT_CEILING_DIRECTORIES
for both package and host builds so that git will not traverse beyond$(BUILD_DIR)
/$(BUILD_DIR_HOST)
.