Support shared_libs, static_libs and default_shared_libs in cc_object

cc_object files don't link against static or shared libraries, but they
can use headers from them.  Make cc_object use the default_shared_libs
headers, and add support for explicit static and shared library
dependencies.

Bug: 153662223
Test: go test ./cc/...
Change-Id: I9ab160ede06db1b135d217d72770c22f500cfe1b

sdk/cc_sdk_test.go

@@ -347,6 +347,7 @@ func TestSnapshotWithObject(t *testing.T) {
 		cc_object {
 			name: "crtobj",
 			stl: "none",
+			default_shared_libs: [],
 			sanitize: {
 				never: true,
 			},
@@ -364,6 +365,7 @@ cc_prebuilt_object {
     apex_available: ["//apex_available:platform"],
     stl: "none",
     compile_multilib: "both",
+    default_shared_libs: [],
     sanitize: {
         never: true,
     },
@@ -388,6 +390,7 @@ cc_prebuilt_object {
     apex_available: ["//apex_available:platform"],
     stl: "none",
     compile_multilib: "both",
+    default_shared_libs: [],
     sanitize: {
         never: true,
     },