chore(cpn): update to Qt 5.15.2 and rework application packaging (#4270)

Co-authored-by: raphaelcoeffic <raphael.coeffic@frafos.com>
Co-authored-by: philmoz <phil.a.mitchell@gmail.com>

cmake/NativeTargets.cmake

@@ -23,12 +23,40 @@ if(Qt5Core_FOUND OR FOX_FOUND)
   set(SDL2_BUILDING_LIBRARY YES)  # this prevents FindSDL from appending SDLmain lib to the results, which we don't want
   find_package("SDL2")
   if(SDL2_FOUND)
-    message(STATUS "SDL2 Lib: ${SDL2_LIBRARIES}; Headers: ${SDL2_INCLUDE_DIRS}")
+    # find_package("SDL2") does not set a variable holding the path to the location of the SDL2 shared library
+    find_file(SDL2_LIB_PATH
+              NAMES
+                libSDL2.so
+                SDL2.dll
+                SDL2.dylib
+              HINTS
+                "/usr/lib/x86_64-linux-gnu"
+                ${SDL2_LIBRARY_PATH})
+    message(STATUS "SDL2 Lib: ${SDL2_LIB_PATH} Libs: ${SDL2_LIBRARIES}; Headers: ${SDL2_INCLUDE_DIRS}")
   else()
-    message(STATUS "SDL not found! Simulator audio, and joystick inputs, will not work.")
+    message(STATUS "SDL2 not found! Simulator audio, and joystick inputs, will not work.")
   endif()
 endif()
 
+if(Qt5Core_FOUND AND NOT DISABLE_COMPANION)
+  find_package(Libusb1)
+  if(LIBUSB1_FOUND)
+    find_package(Dfuutil)
+  endif()
+
+  if(LINUX)
+    find_package(Libssl1)
+  endif()
+
+  # OpenSSL
+  # environment variable set in github workflows and build-edgetx Dockerfile
+  if (DEFINED ENV{OPENSSL_ROOT_DIR})
+    set(OPENSSL_ROOT_DIR "$ENV{OPENSSL_ROOT_DIR}")
+  endif()
+
+  find_package(OpenSSL)
+endif()
+
 # Windows-specific includes and libs shared by sub-projects
 if(WIN32)
   list(APPEND WIN_INCLUDE_DIRS "${RADIO_SRC_DIR}/thirdparty/windows/dirent")