add upstream patch to fix build error

gd-2.2.3-tests.patch

@@ -0,0 +1,42 @@
+From 2b3dd57a6ccb2940f2e9119ae04e14362e2a1f61 Mon Sep 17 00:00:00 2001
+From: Remi Collet <fedora@famillecollet.com>
+Date: Fri, 22 Jul 2016 08:14:12 +0200
+Subject: [PATCH] Fix gd2/gd2_read.c:8:6: error: 'error' may be used
+ uninitialized in this function [-Werror=maybe-uninitialized]
+
+Also report about any error, not only the last one.
+---
+ tests/gd2/gd2_read.c | 6 +-----
+ 1 file changed, 1 insertion(+), 5 deletions(-)
+
+diff --git a/tests/gd2/gd2_read.c b/tests/gd2/gd2_read.c
+index 94fe069..8ce8bd1 100644
+--- a/tests/gd2/gd2_read.c
++++ b/tests/gd2/gd2_read.c
+@@ -5,7 +5,7 @@
+ 
+ int main(int argc, char *argv[])
+ {
+-	int error, i = 0;
++	int error = 0, i = 0;
+ 	gdImagePtr im, exp;
+ 	FILE *fp;
+ 	char *path[] = {
+@@ -40,8 +40,6 @@ int main(int argc, char *argv[])
+ 				gdTestErrorMsg("image %s differs from expected result\n", path[i]);
+ 				gdImageDestroy(im);
+ 				error = 1;
+-			} else {
+-				error = 0;
+ 			}
+ 			if (exp) {
+ 				gdImageDestroy(exp);
+@@ -52,8 +50,6 @@ int main(int argc, char *argv[])
+ 				gdTestErrorMsg("image %s should have failed to be loaded\n", path[i]);
+ 				gdImageDestroy(im);
+ 				error = 1;
+-			} else {
+-				error = 0;
+ 			}
+ 		}
+ 		i++;

gd.spec

@@ -18,6 +18,7 @@ Source0:       https://github.com/libgd/libgd/releases/download/gd-%{version}/li
 %endif
 
 Patch1:        gd-2.1.0-multilib.patch
+Patch2:        gd-2.2.3-tests.patch
 
 BuildRequires: freetype-devel
 BuildRequires: fontconfig-devel
@@ -76,6 +77,7 @@ files for gd, a graphics library for creating PNG and JPEG graphics.
 %prep
 %setup -q -n libgd-%{version}%{?prever:-%{prever}}
 %patch1 -p1 -b .mlib
+%patch2 -p1 -b .build
 
 : $(perl config/getver.pl)