Link library with a test C program

Make a test `includer.c` program that includes the Rust library and
calls our `c_run_key_action()` to see if it actually works. Currently it
doesn't, we get `(null)` printed to stdout.

Add a Makefile with the build command for the C program.

cbindgen.toml:
Remove `KeyActionResult` from exported types, as the `Option` field it
contains caused `gcc` to complain.

cocoa_bridge.rs:
* Comment out all 'cocoa' crate related code as the 'cocoa' code was
  interfering with GCC compilation as a result of my not linking to
  Cocoa frameworks.
* Add a new test map definition that corresponds with the one we look
  for in `includer.c`.

parser.rs:
Add `#[repr(C)]` to `MapKind` because it needs to be exported in the
library and generated into our C header file.

1 files changed, 12 insertions, 0 deletions

diff --git a/includer.c b/includer.c
new file mode 100644
index 0000000..9a02d22
--- /dev/null
+++ b/includer.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include "dome_key_map.h"
+
+#define SIZE 2
+
+int main() {
+	HeadphoneButton trigger[SIZE] = {Play, Down};
+	const CKeyActionResult *result = c_run_key_action(trigger, SIZE);
+	printf("%s", result->action);
+
+	return 0;
+}