graphics/gnome-color-manager: prepare for exiv2-0.27

Import gentoo's (via Mageia) patch:
https://gitweb.gentoo.org/repo/gentoo.git/tree/gnome-extra/gnome-color-manager/files/gnome-color-manager-3.24.0-exiv2-0.27.patch?id=f6715ca3cbae4a86fa3d1bf06b8715ab9993b62d

PR:		235943

graphics/gnome-color-manager/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	gnome-color-manager
 PORTVERSION=	3.28.0
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	graphics gnome
 MASTER_SITES=	GNOME
 DIST_SUBDIR=	gnome

graphics/gnome-color-manager/files/patch-gentoo_00878b

@@ -0,0 +1,42 @@
+Patch kindly borrowed from Mageia.
+
+https://gitlab.gnome.org/GNOME/gnome-color-manager/issues/4
+
+diff -Nru a/src/gcm-helper-exiv.cpp b/src/gcm-helper-exiv.cpp
+--- src/gcm-helper-exiv.cpp	2018-09-04 13:50:05.000000000 +0200
++++ src/gcm-helper-exiv.cpp	2018-12-31 15:39:52.288495398 +0100
+@@ -19,8 +19,7 @@
+  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+  */
+ 
+-#include <exiv2/image.hpp>
+-#include <exiv2/exif.hpp>
++#include <exiv2/exiv2.hpp>
+ #include <iostream>
+ #include <iomanip>
+ 
+@@ -51,7 +50,11 @@
+ 		if (argc == 2)
+ 			filename = argv[1];
+ 		if (filename.empty())
++#if EXIV2_TEST_VERSION(0,27,0)
++			throw Exiv2::Error(Exiv2::kerErrorMessage, "No filename specified");
++#else
+ 			throw Exiv2::Error(1, "No filename specified");
++#endif
+ 		image = Exiv2::ImageFactory::open(filename);
+ 		image->readMetadata();
+ 
+@@ -60,7 +63,11 @@
+ 		if (exifData.empty()) {
+ 			std::string error(argv[1]);
+ 			error += ": No Exif data found in the file";
++#if EXIV2_TEST_VERSION(0,27,0)
++			throw Exiv2::Error(Exiv2::kerErrorMessage, error);
++#else
+ 			throw Exiv2::Error(1, error);
++#endif
+ 		}
+ 
+ 		/* try to find make, model and serial number */
+