librustls: stop using parse.expand

Since we have no macros anymore, it's not needed.

Author: cpu

librustls/cbindgen.toml

@@ -41,7 +41,3 @@ include = ["rustls_tls_version"]
 "feature = aws-lc-rs" = "DEFINE_AWS_LC_RS"
 "feature = ring" = "DEFINE_RING"
 "feature = fips" = "DEFINE_FIPS"
-
-[parse.expand]
-crates = ["rustls-ffi"]
-features = ["read_buf", "aws-lc-rs", "ring", "fips"]