add "Compile and link statically to an external C library" example

[budziq]

trafficstars

Crates	cc
Section	8.3 Build Time Tooling

Use cc crate to compile and link statically to a external/system C library from a build.rs file.

Please note that it will be important to mention that this is a build time crate. Most likely we will dedicate a separate (last) chapter like "build_time.md"

cc https://github.com/rust-lang-nursery/rust-cookbook/issues/236

[zimurgh]

@budziq I'll do this one next

[AndyGauge]

@carpemb I was curious if this was still in the works? Did you hit a roadblock with this that we might help with?

[MickyG03]

Hi, can I work on this?