ncurses 6.3 - patch 20220729

ncurses 6.3 - patch 20220729

+ fixes to build with dietlibc:
  + add configure check for fpathconf (report by Georg Lehner).
  + add configure check for math sine/cosine, needed in test/tclock,
    and eliminate pow() from test/hanoi (report by Georg Lehner).
  + use wcsnlen as an alternative to wmemchr if it is not found
    (adapted from patch by Georg Lehner).
+ trim out some unwanted linker options from ncurses*config and .pc
  files seen in Fedora 36+.