Fix a build failure:
virt-host-validate.c: In function 'main':
virt-host-validate.c:82:5: error: implicit declaration of function 'setlocale' [-Werror=implicit-function-declaration]
virt-host-validate.c:82:5: error: nested extern declaration of 'setlocale' [-Werror=nested-externs]
virt-host-validate.c:82:20: error: 'LC_ALL' undeclared (first use in this function)
* tools/virt-host-validate.c: Add <locale.h>.
* .gitignore: Ignore built executable.
To assist people in verifying that their host is operating in an
optimal manner, provide a 'virt-host-validate' command. For each
type of hypervisor, it will check any pre-requisites, or other
good recommendations and report what's working & what is not.
eg
# virt-host-validate
QEMU: Checking for device /dev/kvm : FAIL (Check that the 'kvm-intel' or 'kvm-amd' modules are loaded & the BIOS has enabled virtualization)
QEMU: Checking for device /dev/vhost : WARN (Load the 'vhost_net' module to improve performance of virtio networking)
QEMU: Checking for device /dev/net/tun : PASS
LXC: Checking for Linux >= 2.6.26 : PASS
This warns people if they have vmx/svm, but don't have /dev/kvm. It
also warns about missing /dev/vhost net.
