Fixing bug in the non-strict top-level identifier matching logic. Matching worked when both bindings were missing, and when both bindings were present at the top-level but different.  The case when only one top-level binding was present wasn't handled correctly. Local lexical matching remains unchanged. Fixes issue #198.
Fixing bug in the non-strict top-level identifier matching logic.
Matching worked when both bindings were missing, and when both
bindings were present at the top-level but different.  The case
when only one top-level binding was present wasn't handled correctly.
Local lexical matching remains unchanged.
Fixes issue #198.

spurious/chibi-scheme-mirror,spurious/chibi-scheme-mirror,spurious/chibi-scheme-mirror