[build] Don't define a package() target

package() targets should not be used for plain shared libraries.
Nothing depends on this package() target any more, so remove it.

Change-Id: I6dc7283c6fc768303ec41db1a38a6f5ccd3e1c9b
diff --git a/BUILD.gn b/BUILD.gn
index d6114a4..4f7c46a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -26,8 +26,6 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import("//packages/package.gni")
-
 # This is the configuration needed to use libxml2.
 config("libxml2_config") {
   include_dirs = [ "include" ]
@@ -168,18 +166,3 @@
     "//third_party/zlib",
   ]
 }
-
-
-package("package") {
-  system_image = true
-
-  package_name = "libxml2"
-
-  deps = [
-    ":libxml2",
-  ]
-
-  libraries = [ {
-        name = "libxml2.so"
-      } ]
-}