Support configure features for C binding

[xxchan]

Most of C binding users will write their own Makefile. We can define some envs and read them in build.rs, but it may need another PR to implement. Do you have interest?

Originally posted by @Xuanwo in #4311 (comment)

[asukaminato0721]

I tend to implement it in CMakeLists and use option to configure them.

ref https://users.rust-lang.org/t/how-to-set-rustflags-by-build-rs-optionally/125686/6