[l2h] Bug conditions don't work

[Klaus Frank]

latex2html compiles this `\newcommand\cond[3]{\ifdefined#1#2\else#3\fi} \cond\foo{true}{false}`
as `truefalse` and within the console it outputs `Unknown commands: ifdefined fi foo else`.
And also `\ifx\undefined\undefined A \else B \fi` results in `A B`

Mit freundlichen Grüßen,
Klaus Frank
MS Administrator Cloud

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