Update libraries for 0.3

[schulzch]

This PR does:

• Parse list of libraries from Cargo.toml (replaces LIBS in build.rs).
• Adds more libraries, based on directory names in lib

Should be in line with #316.

[schulzch]

CI errors are weird (missing libraries on gcc and unknown error for rust 1.0)

[retep998]

toml depends on serde which I believe at some point released a version which could not be parsed by older Cargo. Therefore toml would significantly raise the minimum Rust requirement for winapi which I do not want to do at this time. Also I don't like depending on external crates anyway (they'll steal all my downloads!).

[schulzch]

Ok, I'll remove that part.

I've been playing around with using bindgen on windows.h and it works okay-ish, except for cast-style constants like #define SOME_CONST ((int) 3). I'll push it later on. What are your thoughts on automation in general?

[retep998]

I don't mind people using bindgen to help them write winapi bindings as long as the end result is accurate and in the correct style.

[schulzch]

Done. CI issue seems to be related to AppVeyor (missing libraries).

In case you are interested in experiments with ´rustgen` see winapi-gen-rs.

[retep998]

PR has rather major conflicts.

[retep998]

This PR basically has no point anymore given the way that library dependencies are now handled.