cupid: Drop prebuilt libmemunreachable.so

That's already build implicitly from source as a dependency of android.hardware.audio@7.0-impl

Change-Id: I00407fef7a9bceada953d04d4b024107a070ccc0

proprietary-files.txt

@@ -714,7 +714,6 @@ vendor/lib64/libipebpsstriping170.so
 vendor/lib64/libipebpsstriping480.so
 vendor/lib64/libjpege.so
 vendor/lib64/libmctfengine_stub.so
-vendor/lib64/libmemunreachable.so
 vendor/lib64/libmfGhostDetection.so
 vendor/lib64/libmiStereoFactoryRemapBasicLib.so
 vendor/lib64/libmiai_deblur.so