[landmines] Force clean build to fix Misc V8 Linux gcc

TBR=machenbach@chromium.org

Change-Id: I401a00483425a37ea0e571b1ffa822a665da388e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1649015Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62040}

tools/get_landmines.py

@@ -47,6 +47,7 @@ def print_landmines():  # pylint: disable=invalid-name
   print('Clober again to fix windows build problems.')
   print('Clobber to possibly resolve failure on win-32 bot.')
   print('Clobber for http://crbug.com/668958.')
+  print('Clobber to possibly resolve build failure on Misc V8 Linux gcc.')
   build_get_landmines.print_landmines()
   return 0