Auto merge of #406 - lu-zero:simpler-c-api-instructions, r=pcwalton

Simplify the cargo-c usage and generate the library as libpathfinder

Author: bors-servo

Cargo.lock

@@ -93,14 +93,13 @@ fixes.
 The C bindings use [cargo-c](https://github.com/lu-zero/cargo-c). Install `cargo-c` with
 `cargo install cargo-c`, and then use a command like:
 
-    $ cd c
-    $ cargo cbuild --prefix=/usr/local
-    $ cargo cinstall --prefix=/usr/local
+    $ cargo cinstall --destdir=/tmp/pathfinder-destdir --manifest-path c/Cargo.toml
+    $ sudo cp -a /tmp/pathfinder-destdir/* /
 
-The resulting library is usable via `pkg-config` as `pathfinder_c`. For examples of use, see the
+The resulting library is usable via `pkg-config` as `pathfinder`. For examples of use, see the
 examples in the `examples/` directory beginning with `c_`.
 
-`cargo-c` has a variety of other options such as `--destdir`, which may be useful for packagers.
+`cargo-c` has a variety of other options such as `--prefix`, which may be useful for packagers.
 
 ## Community
 

README.md

@@ -6,6 +6,7 @@ edition = "2018"
 
 [lib]
 crate-type = ["staticlib"]
+name = "pathfinder"
 
 [dependencies]
 font-kit = "0.6"
@@ -52,6 +53,3 @@ metal = "0.18"
 
 [target.'cfg(target_os = "macos")'.dependencies.pathfinder_metal]
 path = "../metal"
-
-[build-dependencies]
-cbindgen = "0.13"