- Make pkg-config files .pc consistent

- Add ncurses patch 20190511
+ fix a spurious blank line seen with "infocmp -1fx xterm+x11mouse"
+ add checks in repair_subwindows() to keep the current position and
scroll-margins inside the resized subwindow.
+ add a limit check in newline_forces_scroll() for the case where the
row is inside scroll-margins, but not at the end (report by Toshio
Kuratomi, cf: 20170729).
+ corrected a warning message in tic for extended capabilities versus
number of parameters.

- Add ncurses patch 20190504
+ improve workaround for Solaris wcwidth versus line-drawing characters
(report by Pavel Stehule).
+ add special case in tic to validate RGB string-capability extension.
+ corrected string/parameter-field for RGB in Caps-ncurses.

- Add ncurses patch 20190427
+ corrected problem in terminfo load/realignment which prevented
infocmp from comparing extended capabilities with the same name
but different types.

- Add ncurses patch 20190420
+ improve ifdef's for TABSIZE variable, to help with AIX/HPUX ports.
- Add ncurses patch 20190413
+ check for TABSIZE variable in test/configure script.
+ used test/test_arrays.c to improve Caps.aix1 and Caps.hpux11
+ corrected filtering of comments in MKparametrized.sh
+ reduce duplication across Caps* files by moving some parts which do