(require 'id) may load executable "id"

[Jim Ursetto]

There is a problem with (require) that is admittedly rare. If you are in a directory:
$ ls
foo foo.so

attempting to (require 'foo) will load the "foo" executable instead of "foo.so". However, in the case below:
$ ls
foo

attempting to (require 'foo) correctly results in an error.

The reason is that ##sys#find-extension returns "foo" in both cases and then ##sys#load attempts to load the literal path before appending any .so or .scm extension. That works unless an executable is in the way. The root cause is that find-extension knows the exact path but doesn't pass that on to load.

Priority minor because this shouldn't affect installed extensions, just development files in the current directory.

[sjamaan]

Fixed in master with a5374e0 and in chicken-5 with 6a15da5.