depends: switch to building libqrencode with CMake

depends/patches/qrencode/cmake_fixups.patch

@@ -0,0 +1,23 @@
+cmake: set minimum version to 3.5
+
+Correct some dev warning output.
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 773e037..a558145 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.1.0)
++cmake_minimum_required(VERSION 3.5)
+ 
+ project(QRencode VERSION 4.1.1 LANGUAGES C)
+ 
+@@ -20,7 +20,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+ set(CMAKE_THREAD_PREFER_PTHREAD ON)
+ find_package(Threads)
+ find_package(PNG)
+-find_package(Iconv)
++find_package(ICONV)
+ 
+ if(CMAKE_USE_PTHREADS_INIT)
+     add_definitions(-DHAVE_LIBPTHREAD=1)