Prevent dependency cycle due to system_shared_libs expansion

It was discovered that we were building some objects inconsistently due
to an optimization in cc_library to only build objects once and use them
for both the static and shared libraries. But static libraries didn't
get system_shared_libs set automatically, and we didn't notice that we
would have built the objects differently.

So static libraries now get the default system_shared_libs, we allow
adjusting that for static vs shared in a cc_library, and we disable the
optimization if the linked libraries are configured differently between
static and shared in a single cc_library.

This triggers dependency cycles for static libraries that libc/libdl
use, so fix those cycles here.

Test: treehugger
Change-Id: I3cf7fda161a05ec32e0c1e871999720d12a4d38e

Android.bp

@@ -1 +0,0 @@
-subdirs = ["*"]

libc/Android.bp

@@ -1623,9 +1623,15 @@ cc_library {
     ],
     name: "libstdc++",
     static_ndk_lib: true,
-    system_shared_libs: ["libc"],
     static_libs: ["libasync_safe"],
 
+    static: {
+        system_shared_libs: [],
+    },
+    shared: {
+        system_shared_libs: ["libc"],
+    },
+
     //TODO (dimitry): This is to work around b/24465209. Remove after root cause is fixed
     arch: {
         arm: {

libdl/Android.bp

@@ -22,6 +22,7 @@ cc_library_static {
     include_dirs: ["bionic/libc"],
 
     stl: "none",
+    system_shared_libs: [],
 
     sanitize: {
         never: true,

linker/Android.bp

@@ -283,6 +283,7 @@ cc_binary {
             suffix: "64",
         },
     },
+    system_shared_libs: [],
     target: {
         android: {
             static_libs: ["libdebuggerd_handler_fallback"],