Run SHCL with libshcl-support in LD_LIBRARY_PATH during CI builds
Run SHCL with libshcl-support in LD_LIBRARY_PATH during CI builds

Since we removed "." from the search path in the
define-foreign-library form, we need to get libshcl-support into a
place that the dynamic linker will look.  We can either install
libshcl-support into one of the system-wide directories or just use
environment variable overrides.  We're going with overrides for now.

bradleyjensen/shcl,bradleyjensen/shcl,bradleyjensen/shcl