[Patch, Fortran] PR32555 re-allow zero to precede the P edit descriptor

[Tobias Burnus]

:ADDPATCH fortran:

My patch for rejecting the "i0" edit decriptor in READ caused a
regression in the NIST test suite by fixing format_lex() such that it
can also return FMT_ZERO.

"k P" seems to be the only place where a preceding number is allowed to
be zero (or negative).

Build (yesterday's svn version)
and regression tested (x86-64/Linux). Ok for the trunk?

Tobias
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