Teach libglaze to look for wrapper library in current working directory

Teach libglaze to look for wrapper library in current working directory

Previously, with libfoo.so in the current directory, the following
command would fail:

	glaze --wrapper=libfoo.so <program> <args>

And to fix things, the user would have to explicitly name the current
working directory such as:

	glaze --wrapper=./libfoo.so <program> <args>

That seems like a silly requirement, (and is an artefact if the logic
of the dynamic loader).

To allow the convenient usage (without "./") we teach libglaze to
explicitly look for the wrapper in the current working directory, and
if found, to resolve its absolute path.