Change directories first

[cinderblock]

If you don't change to the correct directory first, it partially defeats the purpose of doing so.

Fixes bugs like:

ldd: ./bin/libcoreclr.so: No such file or directory
ldd: ./bin/libSystem.Security.Cryptography.Native.OpenSsl.so: No such file or directory
ldd: ./bin/libSystem.IO.Compression.Native.so: No such file or directory