modern cmake, set needed target macro define (#329)

* add "LWS_WITH_LIBUV" define  into websockets cmake files

* add _GNU_SOURCE into luasockets target

Author: drelaptop

lua/luasocket/CMakeLists.txt

@@ -38,6 +38,10 @@ add_library(${target_name} STATIC
   ${${target_name}_src}
 )
 
+if(LINUX)
+  target_compile_definitions(${target_name} PRIVATE _GNU_SOURCE)
+endif()
+
 target_include_directories(${target_name} 
   INTERFACE ..
   PRIVATE ../lua

websockets/CMakeLists.txt

@@ -9,13 +9,13 @@ include(../cmake/CocosExternalConfig.cmake)
 
 add_library(${target_name} STATIC IMPORTED GLOBAL)
 
-# include libs depended
-# add_subdirectory(../openssl ${CMAKE_BINARY_DIR}/websockets/openssl)
-# add_subdirectory(../uv ${CMAKE_BINARY_DIR}/websockets/uv)
-
 set_target_properties(${target_name} PROPERTIES
   INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_SOURCE_DIR}/include/${platform_name}"
 )
+set_target_properties(${target_name} PROPERTIES
+  INTERFACE_COMPILE_DEFINITIONS "LWS_WITH_LIBUV"
+)
+
 set_property(TARGET ${target_name} APPEND PROPERTY INTERFACE_LINK_LIBRARIES "ext_ssl")
 set_property(TARGET ${target_name} APPEND PROPERTY INTERFACE_LINK_LIBRARIES "ext_crypto")
 set_property(TARGET ${target_name} APPEND PROPERTY INTERFACE_LINK_LIBRARIES "ext_uv")