trees: try xgcc build twice if first attempt fails

sometimes buildgcc just fails for like no reason. we had this
the other day and another fix was made to the trees script, to
mitigate; the user ran it again and buildgcc worked just fine.

run it twice, and then call err only if the second one fails.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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