Added feature to build a static sqlite from the bundled amalgamation.

libsqlite3-sys/build.rs

@@ -1,9 +1,11 @@
+extern crate gcc;
 extern crate pkg_config;
 
-use std::env;
-use std::fs;
-
+#[cfg(not(feature = "bundled"))]
 fn main() {
+    use std::env;
+    use std::fs;
+
     // Allow users to specify where to find SQLite.
     let lib_dir = match env::var("SQLITE3_LIB_DIR") {
         Ok(dir) => dir,
@@ -24,3 +26,8 @@ fn main() {
     println!("cargo:rustc-link-lib=sqlite3");
     println!("cargo:rustc-link-search={}", lib_dir);
 }
+
+#[cfg(feature = "bundled")]
+fn main() {
+    gcc::compile_library("libsqlite3.a", &["sqlite3/sqlite3.c"]);
+}