SCP uses the JNI headers in generated code, so several targets need
the include path; this will have no effect on non-SCP builds. Also,
in "protected" builds, there is a generated library that needs to be
linked in the final binary, but this doesn't exist in the "analysis"
step; we create an empty static library if it doesn't exist so it works
on all cases.
Merged from https://widevine-internal-review.googlesource.com/169850
Merged from https://widevine-internal-review.googlesource.com/176177
Bug: 262635528
Change-Id: Ib676d55efbcbec81de9c3123bc70afb570d6caa5
(cherry picked from commit b9482eb23c261788a4432de7566f1b1de1cf9379)
