Free cbindgen from rustc-internal dynamic lib dependencies #135
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This updates cbindgen to use standalone-syn which in turn uses standalone-quote and standalone-proc-macro2, all of which use rustc-ap-proc_macro, which is a fork of the libproc_macro in rustc. This is a workaround for rust-lang/rust#47931 which allows the cbindgen binary to run without requiring all users to hack the LD_LIBRARY_PATH to pick up rustc internal dynamic libraries.