Set CPACK_DEBIAN_PACKAGE_ARCHITECTURE instead of CPACK_DEBIAN_ARCHITECTURE

Because that's the variable actually used by CPack.

cmake/OpenCVPackaging.cmake

@@ -25,21 +25,21 @@ set(CPACK_STRIP_FILES 1)
 
 #arch
 if(X86)
-  set(CPACK_DEBIAN_ARCHITECTURE "i386")
+  set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "i386")
   set(CPACK_RPM_PACKAGE_ARCHITECTURE "i686")
 elseif(X86_64)
-  set(CPACK_DEBIAN_ARCHITECTURE "amd64")
+  set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "amd64")
   set(CPACK_RPM_PACKAGE_ARCHITECTURE "x86_64")
 elseif(ARM)
-  set(CPACK_DEBIAN_ARCHITECTURE "armhf")
+  set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "armhf")
   set(CPACK_RPM_PACKAGE_ARCHITECTURE "armhf")
 else()
-  set(CPACK_DEBIAN_ARCHITECTURE ${CMAKE_SYSTEM_PROCESSOR})
+  set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE ${CMAKE_SYSTEM_PROCESSOR})
   set(CPACK_RPM_PACKAGE_ARCHITECTURE ${CMAKE_SYSTEM_PROCESSOR})
 endif()
 
 if(CPACK_GENERATOR STREQUAL "DEB")
-  set(OPENCV_PACKAGE_ARCH_SUFFIX ${CPACK_DEBIAN_ARCHITECTURE})
+  set(OPENCV_PACKAGE_ARCH_SUFFIX ${CPACK_DEBIAN_PACKAGE_ARCHITECTURE})
 elseif(CPACK_GENERATOR STREQUAL "RPM")
   set(OPENCV_PACKAGE_ARCH_SUFFIX ${CPACK_RPM_PACKAGE_ARCHITECTURE})
 else()