build: set tikv-jemalloc-sys opt-level to 1

`gcc` uses fortify to do bounds checking or some other important thing and in CI it's failing because it's defaulting to -o0

Cargo.toml

@@ -177,3 +177,7 @@ opt-level = 3
 
 [profile.dev.package.blowfish]
 opt-level = 3
+
+# Set the default to optimized so fortify works in CI.
+[profile.dev.package.tikv-jemalloc-sys]
+opt-level = 1