ifdef is still buggy

[danw]

ifdef is still buggy when there is an embedded space in the evaluated variable name. This snippet works in make, but not with kati:

A := a # comment

ifdef $(A)
$(error FAIL)
else
$(info PASS)
endif

a := b
ifdef $(A)
$(info PASS)
else
$(error FAIL)
endif

I don't think we're hitting this anywhere, but I noticed it when looking at the latest change.

[shinh]

Good catch! d236eb0 should have fixed this issue.

I forgot "git add" so I've added testcases in a separate commit: 760f959