Fix 0 before decimal-point in hex float printf fns #1297
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The C standard specifies that, upon handling the a conversion specifier, the argument is converted to a string in which "there is one hexadecimal digit (which is nonzero [...]) before the decimal-point character", this being a requirement which cosmopolitan does not currently always handle, sometimes printing numbers like "0x0.1p+5", where a correct output would have been e.g. "0x1.0p+1" (despite both representing the same value, the first one illegally has a '0' digit before the decimal-point character). This patch fixes this and adds tests which would previously have failed.
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The C standard specifies that, upon handling the a conversion specifier,
the argument is converted to a string in which "there is one hexadecimal
digit (which is nonzero [...]) before the decimal-point character", this
being a requirement which cosmopolitan does not currently always handle,
sometimes printing numbers like "0x0.1p+5", where a correct output would
have been e.g. "0x1.0p+1" (despite both representing the same value, the
first one illegally has a '0' digit before the decimal-point character).
This patch fixes this and adds tests which would previously have failed.