Log Message:
*slib*: update to 3.3.1

2024-01-15  Aubrey Jaffer  <jaffer@jaffer-Vivobook-ASUSLaptop-X1703ZA-K1703ZA>

* require.scm (*slib-version*): Bumped from 3b7 to 3c1.

2023-10-14  Aubrey Jaffer  <agj@alum.mit.edu>

* mklibcat.scm, require.scm (catalog:expand-path): Patch from
Radey Shouman accepts vicinity symbols 'library, 'implementation,
'home, and 'user, which expand to the value of the corresponding
"*-vicinity" procedure.