Enhance uvwasi build process and fix wamrc windows build error (#1046)

And update related document

core/iwasm/libraries/libc-uvwasi/libc_uvwasi.cmake

@@ -2,21 +2,22 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 set (LIBC_WASI_DIR ${CMAKE_CURRENT_LIST_DIR})
-set (UVWASI_DIR ${CMAKE_CURRENT_LIST_DIR}/../../../deps/uvwasi)
+
 set (LIBUV_VERSION v1.42.0)
 
 add_definitions (-DWASM_ENABLE_LIBC_WASI=1 -DWASM_ENABLE_UVWASI=1)
 
 include(FetchContent)
-## https://libuv.org
+
+## libuv
 FetchContent_Declare(
     libuv
     GIT_REPOSITORY https://github.com/libuv/libuv.git
-    GIT_TAG ${LIBUV_VERSION})
-
+    GIT_TAG ${LIBUV_VERSION}
+)
 FetchContent_GetProperties(libuv)
-if(NOT libuv_POPULATED)
-    message ("-- Fetching libuv ..")
+if (NOT libuv_POPULATED)
+    message("-- Fetching libuv ..")
     FetchContent_Populate(libuv)
     include_directories("${libuv_SOURCE_DIR}/include")
     add_subdirectory(${libuv_SOURCE_DIR} ${libuv_BINARY_DIR} EXCLUDE_FROM_ALL)
@@ -24,8 +25,20 @@ if(NOT libuv_POPULATED)
     set_target_properties(uv_a PROPERTIES POSITION_INDEPENDENT_CODE 1)
 endif()
 
-include_directories(${UVWASI_DIR}/include)
+## uvwasi
+FetchContent_Declare(
+    uvwasi
+    GIT_REPOSITORY https://github.com/nodejs/uvwasi.git
+    GIT_TAG main
+)
+FetchContent_GetProperties(uvwasi)
+if (NOT uvwasi_POPULATED)
+    message("-- Fetching uvwasi ..")
+    FetchContent_Populate(uvwasi)
+    include_directories("${uvwasi_SOURCE_DIR}/include")
+    add_subdirectory(${uvwasi_SOURCE_DIR} ${uvwasi_BINARY_DIR} EXCLUDE_FROM_ALL)
+endif()
 
-file (GLOB_RECURSE source_all ${LIBC_WASI_DIR}/*.c ${UVWASI_DIR}/src/*.c)
+file (GLOB_RECURSE source_all ${LIBC_WASI_DIR}/*.c ${uvwasi_SOURCE_DIR}/src/*.c)
 
 set (LIBC_WASI_SOURCE ${source_all})