backend/libpq/be-secure-gssapi.c is including both libpq-be.h and libpq.h,
which makes libpq-be.h superfluous as it gets included via libpq.h. The
attached patch removes the inclusion of libpq-be.h to make be-secure-gssapi.c
behave like other files which need both headers.
cheers ./daniel
