cmAddCustom{Command,Target}Command: Skip conversions on genex paths

If an output or byproduct path starts in a generator expression, do not
convert it to a full path yet.  That will have to be done at generate
time after evaluating the generator expressions.

Also update the `add_custom_target` byproduct path conversion added by
commit 445ff5ccdf (Byproducts: collapse full paths of custom target
byproducts, 2019-09-11, v3.16.0-rc1~103^2~1) to match the behavior of
`add_custom_command` when a path starts in a generator expression.

0 files changed, 0 insertions, 0 deletions