cmake: add missing argument to add_subdirectory

We need the EXCLUDE_FROM_ALL argument when adding git submodules via
add_subdirectory in the CMakeLists file. Without it, the "install" make
target for Jami will also install the submodule's files.

GitLab: #1947
Change-Id: I477c4733951ac5a9fa2b6a52a1463c4a585ab8b7

CMakeLists.txt

@@ -685,7 +685,7 @@ list(APPEND CLIENT_LIBS tidy-static)
 # ZXing-cpp configuration
 set(BUILD_EXAMPLES OFF CACHE BOOL "")
 set(BUILD_BLACKBOX_TESTS OFF CACHE BOOL "")
-add_subdirectory(3rdparty/zxing-cpp)
+add_subdirectory(3rdparty/zxing-cpp EXCLUDE_FROM_ALL)
 
 # Add ZXing-cpp to includes and libraries
 list(APPEND CLIENT_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/zxing-cpp/core/src)