Log Message:
Update uni2ascii to 4.18.
per maintainer's update request by PR 45971.

2011-05-14 4.18
Fixed bug in uni2ascii in which in certain cases the subsitution
      count was too high, fixing Debian bug #626268.
Patched to handle situation in NetBSD which lacks getline.
Clarified semantics of pure option as converting characters
in ascii range other than space and newline.
Fixed bug in which this was not implemented correctly for UTF8 types.

2011-02-16 4.17
Added to uni2ascii the following conversions to nearest ascii equivalent:
       U+2022 bullet to 'o'
       U+00B7 middle dot to period
       U+0085 next line  to newline
       U+2028 line separator to newline

2010-12-12 4.16
Ascii2uni Q format now works again.
Added U+2033 to characters converted to nearest ascii equivalent by uni2ascii B \ 
option.

2010-08-29 4.15
Renamed endian.h u2a_endian.h to avoid conflict with external endian.h.
Removed getline() from ascii2uni.c since it is standard as of POSIX2008.