Drop cross.patch, merged upstream in v1.6.1

debian/patches/cross.patch

@@ -1,15 +0,0 @@
-Author: Helmut Grohne <helmut@subdivi.de>
-Description: do not stop the GUI from being cross-compiled
-Bug-Debian: 941320
-Forwarded: yes
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -39,7 +39,7 @@
- # Dependencies
- ###
- find_package(LibUSB REQUIRED)
--if (NOT APPLE AND NOT WIN32 AND NOT CMAKE_CROSSCOMPILING)
-+if (NOT APPLE AND NOT WIN32)
- 	find_package(PkgConfig)
- 	pkg_check_modules(gtk gtk+-3.0)
- endif ()

debian/patches/series

@@ -1 +0,0 @@
-cross.patch