Fixed printout of floats in minimal printf. #6
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Backported ARMmbed#14179 to fix printing floats.
3.3 would be printed as 3.03, as would 3.4 as the integer value was printed after the decimal point also.
Even with this fix there where another corner case.
0.9976 would be printed as 0.100 as 99 was rounded up without overflowing to the integer value.
With this change 0.9976 is printed as 0.99 (Overflow to integer quite complex...)