Moving get_landmines.py (build/ -> tools-webrtc/)
Moving get_landmines.py (build/ -> tools-webrtc/)

BUG=webrtc:7030
NOTRY=True

Review-Url: https://codereview.webrtc.org/2656553002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16227}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ad452287b04060b01c9137ec6b22524401ce4e98

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk