Update to 1.2.20150920:

2015/09/20
+ decrease table value for minimum number of arguments for the widgets
  which use --no-items option (report by Raven Singularity).
+ update configure macros:
  + use $SHELL consistently, deprecate non-POSIX shell
  + PKG_CONFIG may simply be unset - fix
  + add option to allow changing ABI version, from ncurses6.

(wiz)