Use static libbz for bzip2.

Everyone else is using a static copy (because everyone else is part of
the OTA system), so using a shared library just wastes space...

Before:

  79776 /system/lib64/libbz.so
  36264 /bin/bzip2
 116040

After:

  97200 /bin/bzip2

Test: adb shell ls -l
Change-Id: I90263a10d1fc989e049702a90d29851f47eb81fb
diff --git a/Android.bp b/Android.bp
index a2023e7..0eb9e23 100644
--- a/Android.bp
+++ b/Android.bp
@@ -51,7 +51,7 @@
         "-Werror",
         "-Wno-unused-parameter",
     ],
-    shared_libs: ["libbz"],
+    static_libs: ["libbz"],
     srcs: ["bzip2.c"],
     stl: "none",
     symlinks: [