Link against system-provided sqlite3.

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,4 +36,4 @@
 
 [dependencies.rusqlite]
 version = "0.15.0"
-features = ["bundled", "functions", "unlock_notify"]
+features = ["functions", "unlock_notify"]
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -56,12 +56,6 @@
 ]
 
 [[package]]
-name = "cc"
-version = "1.0.73"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
-
-[[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -224,7 +218,6 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "742b695cbfb89e549dca6960a55e6802f67d352e33e97859ee46dee835211b0f"
 dependencies = [
- "cc",
  "pkg-config",
  "vcpkg",
 ]