replace space with underscore in getdeps triple

Summary: I don't think the spaces were breaking anything, but many years on unix means they set my spidey sense tingling when looking at the build logs.

Reviewed By: StanislavGlebik

Differential Revision: D32619583

fbshipit-source-id: 8d5bc35f085faced20457645f1c1430371a3c578

build/fbcode_builder/getdeps/platform.py

@@ -41,7 +41,7 @@ def get_linux_type():
     if name:
         name = name.lower()
         name = re.sub("linux", "", name)
-        name = name.strip()
+        name = name.strip().replace(" ", "_")
 
     version_id = os_vars.get("VERSION_ID")
     if version_id: