Investigate why stratisd fails to build with libcryptsetup packages when clang_macro_fallback is enabled in those packages

[mulkieran]

We have resolved the problem for libcryptsetup-rs package themselves by specifying the clang_macro_fallback_build_dir. But that does not appear to be working when we use the packages for building stratisd.

.clang_macro_fallback()
.clang_macro_fallback_build_dir(PathBuf::from(env::var("OUT_DIR").unwrap()));