telegram-desktop: fix cross builds

srcpkgs/telegram-desktop/patches/rlottie.patch

@@ -0,0 +1,10 @@
+--- cmake/external/rlottie/CMakeLists.txt	2020-08-11 15:21:17.000000000 +0200
++++ -	2020-08-16 21:24:45.680173438 +0200
+@@ -8,7 +8,6 @@
+ add_library(desktop-app::external_rlottie ALIAS external_rlottie)
+ 
+ if (DESKTOP_APP_USE_PACKAGED)
+-    find_package(rlottie QUIET)
+ 
+     if (rlottie_FOUND)
+         target_link_libraries(external_rlottie INTERFACE rlottie::rlottie)

srcpkgs/telegram-desktop/template

@@ -58,8 +58,4 @@ post_extract() {
 		msg_red "${_qt5_version%_*} does not match ${_qt5_dep_ver}\\n"
 		exit 1
 	fi
-	if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
-		vsed -e '/desktop-app::external_openal/ a atomic' \
-			-i Telegram/CMakeLists.txt
-	fi
 }