[MSVCRT] fix scanf regression

[Raphael]

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Hi,
 
 Since a lot of time the MaxPayneDemo was broken (regression) with a really 
error message:
 
	Exception:
	Parsing message
	"maxpayne_gamemode->gm_changeglobalgamespeed(.8,.0);"
	by "::Alley::camera1" caused following error:

	Unable to parse ".8;.0" with format string '%f,%f'. Check parameter 1

	Closing...

After some testing, i see the game use two scanf (scanf(".8"), scanf(".0")) 
for parsing the script arguments and our implementation of scanf fail on 
parsing ".8" (it expect float numbers always beginning with a number and not 
a dot)

Changelog:
 - fix scanf handling of float numbers (beginning with a dot)

Regards,
Raphael

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