While the `system-server` API surface extends the `module-lib` API
surface a library can only provide one or the other as they appear
in bootclasspath and systemserverclasspath respectively. A library
that is on the bootclasspath cannot provide a `system-server` API
as it would be usable by non-system server code. A library that is
on the systemserverclasspath could provide a `module-lib` API but
there is no point as it would only be usable by the system server
making it effectively a `system-server` API anyway.
As a result the `system-server` extension directories only contain
`service-*` jars for libraries that provide system server APIs.
e.g.
```
$ ls prebuilts/sdk/extensions/11/system-server | cat
api
service-adservices.jar
service-sdksandbox.jar
$ ls prebuilts/sdk/extensions/11/module-lib/ | cat
api
framework-adservices.jar
framework-connectivity.jar
framework-connectivity-t.jar
framework-sdksandbox.jar
framework-tethering.jar
```
So, in order to construct the whole `system-server` API, i.e. the API
visible to the system server, it is necessary to add in the
`module-lib` extension jars too which this change does.
This is necessary to construct an `api-versions.xml` file for the
complete `system-server` API.
Bug: 336993217
Test: TARGETS=$(for i in public system module-lib module-lib-complete system-server-complete; do U=$(echo $i | sed "s|-|_|g"); echo "out/target/common/obj/PACKAGING/api_versions_${U}_generated-api-versions.xml"; done)
m $TARGETS; mkdir -p before; cp $TARGETS before
m $TARGETS; mkdir -p after; cp $TARGETS after
meld before after
# Review differences.
Change-Id: Ic9652dd28f05e5f569a7a30a84b87f227314d119
92efc6107f