circle.yml: uninstall and checks if there are any leftovers
circle.yml: uninstall and checks if there are any leftovers

Check if $PREFIX is still there after uninstall, and if so show
which files are left.

Signed-off-by: Benjamin Tissoires <7a0e50e3f6a0939db82b6a8a423c08a163896f41@gmail.com>

whot/libratbag,libratbag/libratbag,libratbag/libratbag,whot/libratbag,libratbag/libratbag,whot/libratbag