ufraw: add patch to fix compilation for arm

srcpkgs/ufraw/patches/03_fix-unsigned-char.patch

@@ -0,0 +1,14 @@
+Source: written by John Paul Adrian Glaubitz for Debian
+Upstream: https://sourceforge.net/p/ufraw/bugs/417
+Reason: fixes a compilation failure on arm architectures
+--- dcraw.cc
++++ dcraw.cc
+@@ -2285,7 +2285,7 @@ void CLASS quicktake_100_load_raw()
+ 
+ void CLASS kodak_radc_load_raw()
+ {
+-  static const char src[] = {
++  static const signed char src[] = {
+     1,1, 2,3, 3,4, 4,2, 5,7, 6,5, 7,6, 7,8,
+     1,0, 2,1, 3,3, 4,4, 5,2, 6,7, 7,6, 8,5, 8,8,
+     2,1, 2,3, 3,0, 3,2, 3,4, 4,6, 5,5, 6,7, 6,8,