Comment 15 for bug 1752481

Okay check this out. I removes all parts from the project except dpkg and xz-utils to speed things up.

If I have a clean tree and run `snapcraft prime` this is what I end up with:

$ ldd prime/usr/bin/xz
prime/usr/bin/xz: /lib/x86_64-linux-gnu/liblzma.so.5: version `XZ_5.2' not found (required by prime/usr/bin/xz)
 linux-vdso.so.1 => (0x00007ffcfebf4000)
 liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fbb73c45000)
 libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fbb73a28000)
 libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbb7365e000)
 libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fbb7345a000)
 /snap/core/current/lib64/../lib/x86_64-linux-gnu/ld-2.23.so => /lib64/ld-linux-x86-64.so.2 (0x00007fbb73e67000)

Bad. If I clean the tree and now run `snapcraft prime dpkg` followed by `snapcraft prime xz-utils` I get this:

$ ldd prime/usr/bin/xz
 linux-vdso.so.1 => (0x00007ffc261ea000)
 liblzma.so.5 => /home/ubuntu/usd-importer/prime/usr/bin/../lib/liblzma.so.5 (0x00007fae8bbdb000)
 libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fae8b9be000)
 libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fae8b5f4000)
 /snap/core/current/lib64/../lib/x86_64-linux-gnu/ld-2.23.so => /lib64/ld-linux-x86-64.so.2 (0x00007fae8be11000)

Good! I suspect this is Snapcraft not properly re-evaluating its environment as it executes its lifecycle.