[Relocatable] Follow-up 9: Harden processing of SOURCE_DATE_EPOCH in ocamldoc
#226
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Previously, running:
SOURCE_DATE_EPOCH= ocamldoc
resulted in an uncaught Failure "float_of_string" exception. The processing of SOURCE_DATE_EPOCH is firstly hardened to cope with parsing errors and then a one-time warning is displayed the first time it's actually used (at present it's only required in Odoc_man).