Fixes build with gcc 7, by Johannes Hirte.
https://bugs.gentoo.org/show_bug.cgi?id=618068

diff --git a/../old/dcraw.cc b/dcraw.cc
index 88c8068..cedf86b 100644
--- a/../old/dcraw.cc
+++ b/dcraw.cc
@@ -9242,7 +9242,7 @@ canon_a5:
     if (make[0] == 'O') {
       i = find_green (12, 32, 1188864, 3576832);
       c = find_green (12, 32, 2383920, 2387016);
-      if (abs(i) < abs(c)) {
+      if (i < c) {
 	SWAP(i,c);
 	load_flags = 24;
       }