[cost] Remove unused inferconfig

Summary: We don't rely on `external-java-packages` in the inferconfig anymore. Let's remove it altogether.

Reviewed By: jvillard

Differential Revision: D21997962

fbshipit-source-id: 7a2e13cfe

infer/tests/codetoanalyze/java/performance/.inferconfig

@@ -1,12 +0,0 @@
-{
-   "external-java-packages": [
-    "android.",
-    "androidx.",
-    "com.android.",
-    "com.fasterxml",
-    "com.google.",
-    "com.sun.",
-    "io.netty.",
-    "java.",
-    "org."
-  ]}