RFR (T): 8215005: Missing include of runtime/os.hpp in zError.cpp after JDK-8214925 breaks build without precompiled headers

[Thomas Schatzl]

Hi all,

  Linux-x64 without precompiled headers does not build after JDK-
8214925 since the runtime/os.hpp include is missing.

I would like to push this asap to prevent others stumbling over this,
and it is a trivial addition of an include anyway.

CR:
https://bugs.openjdk.java.net/browse/JDK-8215005
Webrev:
http://cr.openjdk.java.net/~tschatzl/8215005/webrev/
Testing:
local compilation

Thanks,
  Thomas