package/qt5/qt5imageformats: fix build with jasper

Fixes:
 - http://autobuild.buildroot.org/results/ea3bc0d3110cb54421ecf433317ca79ca0ff834a
 - http://autobuild.buildroot.org/results/6831dfdd1ecaaa3812de481882040c1742a72aec

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/qt5/qt5imageformats/0001-fix-build-on-Arch-Linux.patch

@@ -0,0 +1,37 @@
+From 704868db61be1542c2d9e2b75ead00c45c56cc36 Mon Sep 17 00:00:00 2001
+From: "Evgeniy A. Dushistov" <dushistov@mail.ru>
+Date: Sat, 15 Aug 2020 15:09:08 +0300
+Subject: fix build on Arch Linux
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp:844:41:
+error: no declaration of «pow»
+  844 |     const double jasperRate = minRate + pow((double(quality) / double(maxQuality)), 2) * maxRate;
+
+Pick-to: 5.15
+Change-Id: I085996c2db2251903b2a3e52e6e648831637c8f9
+Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
+[Retrieved from:
+https://code.qt.io/cgit/qt/qtimageformats.git/commit/?id=704868db61be1542c2d9e2b75ead00c45c56cc36]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ src/plugins/imageformats/jp2/qjp2handler.cpp | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/plugins/imageformats/jp2/qjp2handler.cpp b/src/plugins/imageformats/jp2/qjp2handler.cpp
+index 4311d26..05c7bc1 100644
+--- a/src/plugins/imageformats/jp2/qjp2handler.cpp
++++ b/src/plugins/imageformats/jp2/qjp2handler.cpp
+@@ -45,6 +45,7 @@
+ #include "qcolor.h"
+ 
+ #include <jasper/jasper.h>
++#include <math.h> // for pow
+ 
+ QT_BEGIN_NAMESPACE
+ 
+-- 
+cgit v1.2.1
+