[Gsll-devel] use ASDF's temporary-directory in favor of Osicat's

Hello, GSLL uses the Osicat library for the only purpose of obtaining a valid temporary directory. The new ASDF 3 (actually UIOP) offers the same functionality. Since GSLL depends on ASDF which uses UIOP, I propose that it switches to UIOP's version. This minor point would simplify installation of GSLL on Windows. Mirko