libnewt: update 0.52.21 -> 0.52.23

0.52.23
- fix automatic height of menu/list in whiptail (broken in 0.52.22)
- fix automatic width of whiptail --yesno box
- fix automatic width in whiptail with unicode characters
- fix automatic width with whiptail --noitem and --notags options
- fix spacing with longer tags in whiptail
- avoid overlapping backtitle in whiptail with automatic height

0.52.22
- fix crash in whiptail with new libpopt
- switch from usleep to nanosleep (Rosen Penev)
- fix libnewt.pc to enable static linking (Alexey Sheplyakov)
- fix LDFLAGS order in snack linking (Sam James)
- use CFLAGS when compiling snack
- improve configure.ac (Thomas Kuehne)
- install header and libnewt.pc with shared library (Michael Olbrich)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit ff126224)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>