[PyQt] Minor bug in building SIP

[Wallboy]

Just tried building SIP with --sip-module PyQt5-Sip.sip and during `nmake
install` the mk_distinfo.py script fails at Line 70 with 

ValueError: too many values to unpack (expected 2)

as it's trying to split on hyphens, but because I used the hyphen in the sip
module name: `PyQt5-Sip.sip` it gives that error.



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