Install jni symlinks in Soong

The installation of the symlink
(<partition>/app/MyApp/lib/<arch>/libfoo.so) and its target
(/system/lib64/libfoo.so) are now done int Soong.

I gave up the idea of always embedding jni libs to apps, due to a
hard-to-fix regression in storage usage. Specifically, consider this
case.

app --(jni_lib)--> libfoo
    --(jni_lib)--> libbar

libfoo --(shared_lib)--> libbar

Ideally, with the embedding idea, both libfoo and libbar should be
embedded into the app and there should be no libfoo or libbar outside of
the apk, unless there's no dependency to any of them from outside of the
apk.

However, the previous implementation installed libbar to /system/lib64,
leading two copies of the lib; one in /system/lib64, the other in the
apk.

This was happening because libbar was also considered as a transitive
dep of libfoo, and therefore a dependency to its installation path is
added to the apk. The problem here is that the app doesn't know that
libfoo depends on libbar. We in theory can write a very delicate
dependency traverse routine which filters libbar out of the transitive
deps, but that looked too complicated.

Bug: 339923078
Bug: 330276359
Test: Build and watch any bloatbuster warning
Test: m aosp_cf_system_x86_64
The following three files are found
* system/lib64/libnfc_nci_jni.so
* system/etc/libnfc-nci.conf
* system/priv-app/NfcNci/lib/arm64/libnfc_nci_jni.so

Change-Id: I0930cb1ebb8ca8a6efd64b1ce2cdfd1c47fe19ef

java/java.go

@@ -491,6 +491,7 @@ type jniLib struct {
 	coverageFile   android.OptionalPath
 	unstrippedFile android.Path
 	partition      string
+	installPaths   android.InstallPaths
 }
 
 func sdkDeps(ctx android.BottomUpMutatorContext, sdkContext android.SdkContext, d dexer) {