read-until-match: streamline get_char calls.

Similarly to what was done in get_csv, we optimize he
use of get_char and unget_char. I see a 7.5% speed
improvement in a simple benchmark of the awk macro
with the record separator rs set to #/\n/.

* regex.c (scan_until_common): Obtain the strm_ops
operations of the stream, and pull the low level
get_char and unget_char virtual operations from it.
Call these directly in the loop. Thereby, we avoid
all the type checking overhead in these functions.

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