Fix typo in host ruststd path

Turns out there is a typo in the definition of host rust std library
path. This mostly likely has caused the build to end up using system
installed std library. It also fails doc tests as they run in some
sort of sandbox environment which doesn't have access to system stuff.

Change-Id: I4b3592ec33fd78a84a9c248e9bd4e32b2c8626be
3 files changed
tree: c4d7c0fbd063fc83a312335fb133cff846a29642
  1. gbl/
  2. libxbc/
  3. vts/
  4. .gitignore
  5. BUILD
  6. OWNERS