unifdef: Fix collision check when adding symbols.

findsym() is intended for use while parsing input, so it should not be
called from addsym2() or indirectsym(), which are called before any
input is

unifdef: Fix collision check when adding symbols.

findsym() is intended for use while parsing input, so it should not be
called from addsym2() or indirectsym(), which are called before any
input is processed.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D48733

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