libgdal: add another patch

srcpkgs/libgdal/patches/ab72c4893e6d14d488dfed25745d79f11bee45b9.patch

@@ -0,0 +1,31 @@
+From ab72c4893e6d14d488dfed25745d79f11bee45b9 Mon Sep 17 00:00:00 2001
+From: Even Rouault <even.rouault@spatialys.com>
+Date: Mon, 10 Aug 2020 17:26:53 +0200
+Subject: [PATCH] JPEG2000: fix build with Jasper 2.0.17 (fixes #2844)
+
+---
+ gdal/frmts/jpeg2000/jpeg2000dataset.cpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/gdal/frmts/jpeg2000/jpeg2000dataset.cpp b/gdal/frmts/jpeg2000/jpeg2000dataset.cpp
+index 3e668ffe503..2d3f4e46876 100644
+--- frmts/jpeg2000/jpeg2000dataset.cpp
++++ frmts/jpeg2000/jpeg2000dataset.cpp
+@@ -484,7 +484,7 @@ int JPEG2000Dataset::DecodeImage()
+     /* the JP2 boxes match the ones of the code stream */
+     if (nBands != 0)
+     {
+-        if (nBands != jas_image_numcmpts( psImage ))
++        if (nBands != static_cast<int>(jas_image_numcmpts( psImage )))
+         {
+             CPLError(CE_Failure, CPLE_AppDefined,
+                      "The number of components indicated in the IHDR box (%d) mismatch "
+@@ -595,7 +595,7 @@ GDALDataset *JPEG2000Dataset::Open( GDALOpenInfo * poOpenInfo )
+ 
+ {
+     int         iFormat;
+-    char        *pszFormatName = nullptr;
++    const char *pszFormatName = nullptr;
+ 
+     if (!Identify(poOpenInfo))
+         return nullptr;