Compilers do not necessarily output all includes files when included
using a PCH, so when a PCH is being rebuilt, it might actually get
reused this way, causing its dependencies to be incomplete afterwards.
The PCH actually should not be used when being regenerated, but with MSVC
this apparently happens, even though there's only the option to create
PCH, not to use it.

Change-Id: Iee1340a60085550ab867304c44752daa04cbba31