Fix link apex for jni libs

When library_path is ":" splitted list of .jar files, we should iterate
over each .jar file path to link a proper APEX namespace for JNI lib.

Bug: 169826971
Test: libnativeloader_test
Test: move libicing to appsearch apex
Change-Id: I3df47203d336036d0e015f9c5421b30a0377087f
3 files changed