getdeps: support GETDEPS_WGET_ARGS in wget version

Summary:
X-link: facebook/proxygen#495

X-link: facebook/mvfst#337

X-link: facebook/fboss#194

X-link: facebookincubator/zstrong#748

I found it useful to be able to set `GETDEPS_WGET_ARGS` to change some of the flags to `wget` while it's in that fetch mode :)

Differential Revision: D56263907

Author: codyohl

build/fbcode_builder/getdeps/fetcher.py

@@ -683,15 +683,18 @@ def progress_pycurl(self, total, amount, _uploadtotal, _uploadamount):
     start = time.time()
     try:
         if os.environ.get("GETDEPS_USE_WGET") is not None:
-            subprocess.run(
+            procargs = (
                 [
                     "wget",
+                ]
+                + os.environ.get("GETDEPS_WGET_ARGS", "").split()
+                + [
                     "-O",
                     file_name,
                     url,
                 ]
             )
-
+            subprocess.run(procargs, capture_output=True)
             headers = None
 
         elif os.environ.get("GETDEPS_USE_LIBCURL") is not None: