rust: clean root, move build files inside folder

rust/Cargo.toml

@@ -8,7 +8,7 @@ description = "Low-level Rust bindings for the notcurses C library."
 repository = "https://github.com/dankamongmen/notcurses"
 homepage = "https://nick-black.com/dankwiki/index.php/Notcurses"
 links = "notcurses"
-build = "build.rs"
+build = "build/build.rs"
 categories = [
 	"external-ffi-bindings",
 	"command-line-interface",

rust/build/build.rs

@@ -15,7 +15,7 @@ fn main() {
     println!("cargo:rerun-if-changed=wrapper.h");
 
     cc::Build::new()
-        .file("stdout.c")
+        .file("build/stdout.c")
         .compile("stdout");
 
     // The bindgen::Builder is the main entry point to bindgen, and lets you
@@ -24,9 +24,8 @@ fn main() {
         .use_core()
         .ctypes_prefix("cty")
         .clang_arg("-D_XOPEN_SOURCE")
-        // The input header we would like to generate
-        // builder for.
-        .header("wrapper.h")
+        // The input header we would like to generate builder for.
+        .header("build/wrapper.h")
         // generate comments, also from headers and not just doc comments (///)
         .generate_comments(true)
         .clang_arg("-fretain-comments-from-system-headers")