Force link _printf_float in dtostrf #111
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Fix typedef syntax
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Resolves #109.
_printf_floatwill only get linked in whendtostrfis used.Alternative is to add a
-u _printf_floatlinker flag, but this will increase sketch size for all sketches even if float support for printf is not needed.(https://github.com/32bitmicro/newlib-nano-1.0/blob/master/newlib/README.nano)