feat(Cmake): Rewrite build and use inherited dependencies (#1652)

deps/bzip2/CMakeLists.txt

@@ -1,4 +1,4 @@
-# Copyright (C)
+# Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU AGPL3 v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
 #
 # This file is free software; as a special exception the author gives
 # unlimited permission to copy and/or distribute it, with or without
@@ -8,15 +8,33 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
-file(GLOB sources *.c)
+if(UNIX)
+  # Look for an installed bzip2 on unix
+  find_package(BZip2 REQUIRED)
 
-set(bzip2_STAT_SRCS
-  ${sources}
-)
+  add_library(bzip2 SHARED IMPORTED GLOBAL)
 
-include_directories(
-  ${CMAKE_SOURCE_DIR}/deps/zlib
-  ${CMAKE_CURRENT_SOURCE_DIR}
-)
+  set_target_properties(bzip2
+    PROPERTIES
+      IMPORTED_LOCATION
+        "${BZIP2_LIBRARIES}"
+      INTERFACE_INCLUDE_DIRECTORIES
+        "${BZIP2_INCLUDE_DIRS}")
+else()
+  # Use the bundled source on windows
+  file(GLOB sources *.c)
+  add_library(bzip2 STATIC
+    ${sources})
 
-add_library(bzip2 STATIC ${bzip2_STAT_SRCS})
+  # Group sources
+  GroupSources(${CMAKE_CURRENT_SOURCE_DIR})
+
+  target_include_directories(bzip2
+    PUBLIC
+      ${CMAKE_CURRENT_SOURCE_DIR})
+
+  set_target_properties(bzip2
+    PROPERTIES
+      FOLDER
+        "deps")
+endif()