add rapidhttp && suprot submodule git update

Author: 杨超

3rdparty/depends.py

@@ -164,6 +164,8 @@ def download_libs(self):
                 source_path = os.path.join(SOURCE_DIR, name)
                 if not os.path.exists(source_path):
                     run_cmd("cd %s && git clone %s %s"%(SOURCE_DIR, git_url, name))
+                    if attr.get('submodule'):
+                        run_cmd("cd %s/%s && git submodule update --init" %(SOURCE_DIR, name))
                     if attr.get('tag'):
                         run_cmd("cd %s && git checkout %s"%(source_path, attr.get("tag")))    
 

3rdparty/depends.yaml

@@ -19,5 +19,8 @@ depends:
       tag: v0.4.0
       cmake_args:
           - -DWITH_GFLAGS=OFF 
+  rapidhttp:
+      git: https://github.com/magicsupery/rapidhttp.git
+      submodule: true
   #glad:
       #local: true