We might eventually want to use Mike Hommey's "faulty.lib" dynamic
linker (developed for Firefox on Android) to get around the Android
system dynamic linker's silly limitations. It does not like
DT_RPATH. (The Android system dynamic linker just ignores those.) So
no point putting RPATH into the ICU libs for Android.

Note that the faulty.lib linker is not usable currently because it
doesn't like the text relocations that the NDK r8 toolchain generates
for some reason. Sigh.

Change-Id: I9092c6001f0aadbb30e2682e33e7179520846f3b