added guard macros to ndk_set_var.h
added guard macros to ndk_set_var.h

yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,simpl/ngx_devel_kit,yeahdongcn/SEnginx,noname007/ngx_devel_kit,yeahdongcn/SEnginx,simpl/ngx_devel_kit,noname007/ngx_devel_kit,yeahdongcn/SEnginx,simpl/ngx_devel_kit,noname007/ngx_devel_kit,yeahdongcn/SEnginx