Make styled_format more compatible with igc

* src/editfns.c (styled_format): Don’t call SAFE_ALLOCA_LISP_EXTRA,
as this makes life more difficult in the feature/igc3 branch.
Also, allocate another byte for the format string trailing '\0',
so that we don’t rely in the str2num trick with trailing '\1'.
Problems reported by Pip Cet (Bug#81057#32).
Also, check alloca size more exactly.  Ameliorate the extra
conditional branches by doing all the internal size calculations
before a conditional branch on overflow.

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