Change I58e1ae1c91f4a62e80eaf4e16e9932d8bab17c74 has introduced a reference to config.h,
which is not there in a case of building a static standalone vppctl.
Solution: add a variable STATIC_VPPCTL which, when defined, avoids including
the missing include file. Thanks a lot to Damjan for the suggestion.
Type: fix
Change-Id: I133235ba07e5c2e0d5669be9c2292cab0fdf436f
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>