Fix gcolor3 to work with libportal-0.5

This patch is extracted from upstream, see here
https://gitlab.gnome.org/World/gcolor3/-/commit/1750369a3fd922aa9db6916207dc460c6f885e14

From 1750369a3fd922aa9db6916207dc460c6f885e14 Mon Sep 17 00:00:00 2001
From: Michal Vasilek <michal@vasilek.cz>
Date: Mon, 27 Dec 2021 13:47:14 +0100
Subject: [PATCH] Update to libportal 0.5

---
 meson.build                   | 2 ++
 src/gcolor3-color-selection.c | 2 +-
 src/meson.build               | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index 6453679..7d6dc50 100644
--- a/meson.build
+++ b/meson.build
@@ -7,9 +7,11 @@ dep_gtk = dependency('gtk+-3.0', version: '>= 3.20.0', required: true)
 dep_libportal = dependency(
   'libportal',
   required: true,
+  version: '>= 0.5',
   fallback: ['libportal', 'libportal_dep'],
   default_options: ['gtk_doc=false'],
 )
+dep_libportal_gtk3 = dependency('libportal-gtk3', version: '>= 0.5', required: true)
 cc = meson.get_compiler('c')
 dep_lm = cc.find_library('m', required: true)
 
diff --git a/src/gcolor3-color-selection.c b/src/gcolor3-color-selection.c
index 7413850..5df9d54 100644
--- a/src/gcolor3-color-selection.c
+++ b/src/gcolor3-color-selection.c
@@ -41,7 +41,7 @@
 #include <gtk/gtk.h>
 #include <glib/gi18n.h>
 #include <libportal/portal.h>
-#include <libportal/portal-gtk3.h>
+#include <libportal-gtk3/portal-gtk3.h>
 
 #ifdef ENABLE_NLS
 #define P_(String) g_dgettext(GETTEXT_PACKAGE "-properties",String)
diff --git a/src/meson.build b/src/meson.build
index 3998f68..d488e51 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -42,6 +42,7 @@ executable(
   dependencies: [
     dep_gtk,
     dep_libportal,
+    dep_libportal_gtk3,
     dep_lm