refactor: rename to gpcommon

gpcommon/build.rs

@@ -0,0 +1,12 @@
+fn main() {
+    // Link to the native openconnect library
+    println!("cargo:rustc-link-lib=openconnect");
+    println!("cargo:rerun-if-changed=src/vpn/vpn.c");
+    println!("cargo:rerun-if-changed=src/vpn/vpn.h");
+
+    // Compile the vpn.c file
+    cc::Build::new()
+        .file("src/vpn/vpn.c")
+        .include("src/vpn")
+        .compile("vpn");
+}