libiio: fix build with wrong libxml2 find_package

Co-authored-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>

pkgs/development/libraries/libiio/cmake-fix-libxml2-find-package.patch

@@ -0,0 +1,13 @@
+diff --color -ur a/CMakeLists.txt b/CMakeLists.txt
+--- a/CMakeLists.txt	2021-05-30 13:46:22.256040282 +0200
++++ b/CMakeLists.txt	2021-05-30 14:15:42.530181216 +0200
+@@ -333,7 +333,7 @@
+ # So, try first to find the CMake module provided by libxml2 package, then fallback
+ # on the CMake's FindLibXml2.cmake module (which can lack some definition, especially
+ # in static build case).
+-find_package(LibXml2 QUIET NO_MODULE)
++find_package(LibXml2 QUIET MODULE)
+ if(DEFINED LIBXML2_VERSION_STRING)
+ 	set(LIBXML2_FOUND ON)
+ 	set(LIBXML2_INCLUDE_DIR ${LIBXML2_INCLUDE_DIRS})
+Seulement dans b: good.patch

pkgs/development/libraries/libiio/default.nix

@@ -23,6 +23,10 @@ stdenv.mkDerivation rec {
     sha256 = "0psw67mzysdb8fkh8xpcwicm7z94k8plkcc8ymxyvl6inshq0mc7";
   };
 
+  # Revert after https://github.com/NixOS/nixpkgs/issues/125008 is
+  # fixed properly
+  patches = [ ./cmake-fix-libxml2-find-package.patch ];
+
   nativeBuildInputs = [
     cmake
     flex