printf: emit more contiguous text to improve escape sequences

Users have a reasonable expectation that printf should be able
to construct ANSI escape sequences and have them take effect.

This expectation isn't met because printf tends to output one
character at a time whereas busybox-w32 needs escape sequences
to be output contiguously

Force printf to output contiguous text in two cases:

- literal text in the format string
- string arguments output using the '%b' format specifier

(See GitHub issue #189.)

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