Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/expat/CMakeLists.txt

@@ -0,0 +1,36 @@
+cmake_minimum_required(VERSION 3.13)
+project(expat)
+
+add_library(expat STATIC
+    xmlparse.c
+    xmlrole.c
+    xmltok.c
+)
+
+target_include_directories(expat PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_sources(expat PRIVATE
+    ascii.h
+    asciitab.h
+    expat.h
+    expat_config.h
+    expat_external.h
+    iasciitab.h
+    internal.h
+    latin1tab.h
+    nametab.h
+    utf8tab.h
+    xmlrole.h
+    xmltok.h
+    xmltok_impl.h
+)
+
+if(WIN32)
+    target_compile_definitions(expat PRIVATE COMPILED_FROM_DSP XML_STATIC)
+endif()
+
+if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
+    target_compile_options(expat PRIVATE -Wno-unused-parameter)
+endif()