wamr-wasi-extensions: add lib-socket things (#4360)

wamr-wasi-extensions/socket/CMakeLists.txt

@@ -0,0 +1,20 @@
+set(wasi_socket_dir ${CMAKE_CURRENT_SOURCE_DIR}/../../core/iwasm/libraries/lib-socket)
+set(wasi_socket_header_dir ${wasi_socket_dir}/inc)
+
+set(srcs ${wasi_socket_dir}/src/wasi/wasi_socket_ext.c)
+set(headers
+    ${wasi_socket_header_dir}/wasi_socket_ext.h
+)
+
+add_library(wamr-wasi-socket STATIC ${srcs})
+set_property(TARGET wamr-wasi-socket PROPERTY PUBLIC_HEADER ${headers})
+target_include_directories(wamr-wasi-socket
+                           PUBLIC
+                           $<BUILD_INTERFACE:${wasi_socket_header_dir}>
+                           $<INSTALL_INTERFACE:include>)
+
+install(TARGETS wamr-wasi-socket
+        EXPORT wamr-wasi-socket-config
+        PUBLIC_HEADER DESTINATION include)
+install(EXPORT wamr-wasi-socket-config
+        DESTINATION lib/cmake/wamr-wasi-socket)