Remove build directory once build of jemalloc-sys finishes

And link to the libraries installed with `make install` instead.
This saves disk space in the `target` directory.

Author: Kobzol

jemalloc-sys/build.rs

@@ -318,6 +318,9 @@ fn main() {
         .arg("-j")
         .arg(num_jobs));
 
+    // Remove the build directory to avoid it wasting disk space in the target directory
+    fs::remove_dir_all(build_dir).unwrap();
+
     println!("cargo:root={}", out_dir.display());
 
     // Linkage directives to pull in jemalloc and its dependencies.
@@ -332,7 +335,7 @@ fn main() {
     } else {
         println!("cargo:rustc-link-lib=static=jemalloc_pic");
     }
-    println!("cargo:rustc-link-search=native={}/lib", build_dir.display());
+    println!("cargo:rustc-link-search=native={}/lib", out_dir.display());
     if target.contains("android") {
         println!("cargo:rustc-link-lib=gcc");
     } else if !target.contains("windows") {