[config] skip non-existing library
[config] skip non-existing library

If provider/loader does not exist, ignore it. It solves issues if
library was removed while not unregistered

Signed-off-by: Denis Zalevskiy <43c40921ef02e9bb53daac07eb9ed16452640d88@jolla.com>

android-808/statefs,android-808/statefs,android-808/statefs,android-808/statefs