pinentry: add patch to fix ncursesw include path

Upstream pinentry seems to assume a fixed include path for ncursesw,
while still using pkg-config to check what that path should be.
This results in detecting the library during config failing to include
it correctly during build.

Fixes:
  http://autobuild.buildroot.org/results/d8d/d8d33efd16cc94dc9d9d4b2d7615a0abb5752ee4/
  http://autobuild.buildroot.org/results/c48/c4805785077e955c61f246d0e4d8416d8dbd10b1/
  http://autobuild.buildroot.org/results/144/14483d35ab5009e854c7ce86e26942fdefd5c1f0


and bunch of others.

Signed-off-by: Gergely Imreh <imrehg@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>