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Tcl comments and if statements

Tcl seems to have the strange problem of not really ignoring commented-out
"if" statements.  Specifically, if you have braces that are commented out,
it will complain of unbalanced braces.

The code:

# if { is-hardware-encode } {
  if { 0 } {
      ...
  }

will fail, because there is no closing brace for the commented out
first "if".

I fixed a couple of files in the repository that have this problem.  Just
thought I'd warn people.

Erik