By setting these variables, we can skip tests that fail on
RHEL 5.

RHEL 5-era FUSE didn't have this function.

I copied the function out of upstream FUSE, since the license is
compatible.

gettextize provides a local file called "gettext.h".  Remove this and
use <libintl.h> from glibc headers instead.

Most of this change is mechanical: #include <libintl.h> in every C
file which uses any gettext function.  But also we remove the
gettext.h file, and adjust the "_" macros.

Note that this effectively removes the ./configure --disable-nls
option, although we don't know if that ever worked.

Fix compilation failure on F17

Add FUSE support directly to the API.  Instead of needing to use the
external 'guestmount' command, you can mount the libguestfs filesystem
space on a local mountpoint using an API call from any language.

Note that although mount-local-run is marked as Cancellable, the
current implementation does not support it, but it would be relatively
simple to add it.

virt-filesystems requires -a/-d option.

Analyze all uses of 'int' in the code, and replace with 'size_t' where
appropriate.

Change hard code 3 to O_ACCMODE.
it'll be more sensible.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>