[coreboot] [PATCH]Remove perl dependency

[Patrick Georgi]

Hi,

attached patch replaces two perl calls with sed, and adds an alternative
for another two (using GNU date, and with limited impact if both
alternatives fail)

Those were the remaining perl calls in our build tree, so remove perl
from our dependency list in README.


Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
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