Move in-tree dependencies to their own folder

src/ should only contain our code. Move the in-tree dependencies to dep/
This allows us (if necessary) to e.g. exclude that part of the tree from being analyzed by
various tools or mark it as external code in IDEs.

CMakeLists.txt

@@ -833,6 +833,7 @@ configure_file(zmlinkcontent.sh.in "${CMAKE_CURRENT_BINARY_DIR}/zmlinkcontent.sh
 include(Pod2Man)
 
 # Process subdirectories
+add_subdirectory(dep)
 add_subdirectory(src)
 add_subdirectory(scripts)
 add_subdirectory(db)

dep/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_subdirectory(jwt-cpp)
+add_subdirectory(libbcrypt)

src/CMakeLists.txt

@@ -70,9 +70,6 @@ set(ZM_BIN_SRC_FILES
   zm_zone.cpp
   zm_storage.cpp)
 
-add_subdirectory(jwt-cpp)
-add_subdirectory(libbcrypt)
-
 # A fix for cmake recompiling the source files for every target.
 add_library(zm STATIC ${ZM_BIN_SRC_FILES})