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For example, without this change, (format "%2147483648d" 1) dumps
core on x86-64 GNU/Linux.  Use EMACS_INT, not size_t, for sizes,
since we prefer using signed values, and EMACS_INT will be big
enough soon, even on 32-bit hosts.  Also, prefer EMACS_INT to int
for sizes.  Don't assume that pI is either "l" or ""; it might be
"ll" or "I64".  Check for width and precision greater than
INT_MAX, as this can make sprintf go kaflooey.  (Bug#8668)