Since gnulib commit 6954995d unistd.h is included via stdlib.h
on BSD systems, which requires config.h to be included first.

Add config.h to the files that use it.

Part of this commit reverts commit 6ee918deSigned-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

These two examples do not use any definition from config.h, and by
removing it these examples can be compiled standalone.
Signed-off-by: NMarcos Paulo de Souza <marcos.souza.org@gmail.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

For instance:

hellolibvirt/hellolibvirt.c: In function 'showDomains':
hellolibvirt/hellolibvirt.c:100:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < numNames; i++) {
                   ^
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Recent changes uncovered a NEGATIVE_RETURNS when processing 'numNames'
in 'showDomains' in the for loop after a possible -1 return.

Convert the type of loop iterators named 'i', 'j', k',
'ii', 'jj', 'kk', to be 'size_t' instead of 'int' or
'unsigned int', also santizing 'ii', 'jj', 'kk' to use
the normal 'i', 'j', 'k' naming
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Update the hellolibvirt example program to demonstrate use of
the virGetLastErrorMessage() API for quick error reporting
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Change the order of some conditions and use the AllDomains API to get
a list of all the active and defined domains, then use the Active and
Name API's in order to print.

This changes here adjust the output from:

Attempting to connect to hypervisor
Connected to hypervisor at "qemu:///system"
Hypervisor: "QEMU" version: 0.32.656
There are 0 active and 2 inactive domains
Inactive domains:
  foo
  bar
Disconnected from hypervisor

to

Attempting to connect to hypervisor
Connected to hypervisor at "qemu:///system"
Hypervisor: "QEMU" version: 0.32.656
There are 0 active and 2 inactive domains
       foo (non-active)
       bar (non-active)
Disconnected from hypervisor

* Makefile.am configure.in examples/hellolibvirt/Makefile.am
  examples/hellolibvirt/hellolibvirt.c: new trivial example program
  by David Allan
Daniel