Make sure to include config.h in every compilation unit. Otherwise,

Make sure to include config.h in every compilation unit. Otherwise,
the necessary defines will only be visible as a side effect of
including other headers, leading to problems with things like
translations, which will fail in various places.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4646 3789f03b-4d11-0410-bbf8-ca57d06f2519