fate: workaround for slighly broken 'test' shell builtin
Some shells, e.g. minix3, have a broken 'test' builtin which fails
if the first operand of a binary operator looks like a unary operator.
Prefixing the values with 'x' prevents this from happening.
Signed-off-by:
Mans Rullgard <mans@mansr.com>
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