Remove libdl from shared_libs

This entry is redundant, as system_shared_libs by default includes
libdl.

This should be a no-op change for the current build system, but avoids
an issue on the alternative (experimantal) build system, Bazel.

Test: md5sum libutils.so before/after on aosp_flame, verified no changes
Change-Id: I18f6e67c3e23299a0f1e0ef530a0a809b068dc03
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 13e4c02..e6d9a4c 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -99,7 +99,6 @@
 
             shared_libs: [
                 "libprocessgroup",
-                "libdl",
                 "libvndksupport",
             ],