fprint_demo: fix build

srcpkgs/fprint_demo/patches/ftbfs-libfprint-080.patch

@@ -0,0 +1,27 @@
+From ea44a11a48ca1a558e3c9cb0a0504699e6b556fa Mon Sep 17 00:00:00 2001
+From: Bastien Nocera <hadess@hadess.net>
+Date: Mon, 8 Oct 2018 16:48:03 +0200
+Subject: [PATCH] main: Fix compilation with libfprint >= 0.8.0
+
+With API to be added to libfprint 0.8.3
+---
+ src/verify.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/src/verify.c b/src/verify.c
+index d3777bc..4f7f8e9 100644
+--- src/verify.c
++++ src/verify.c
+@@ -236,7 +236,11 @@ static void plot_minutiae(unsigned char *rgbdata, int width, int height,
+ 
+ 	for (i = 0; i < nr_minutiae; i++) {
+ 		struct fp_minutia *min = minlist[i];
+-		size_t pixel_offset = (min->y * width) + min->x;
++		int x, y;
++		size_t pixel_offset;
++
++		fp_minutia_get_coords(min, &x, &y);
++		pixel_offset = (y * width) + x;
+ 		write_pixel(pixel_offset - 2);
+ 		write_pixel(pixel_offset - 1);
+ 		write_pixel(pixel_offset);