xts warning fixes round 1 (was: [ANNOUNCE] xts 0.99.0)

[Aaron Plattner]

On Wed, May 25, 2011 at 03:57:04AM -0700, Cyril Brulebois wrote:
> Hi,
> 
> Aaron Plattner <aplattner at nvidia.com> (24/05/2011):
> > Patches to fix warnings in the build or the tests themselves would
> > be very much appreciated. […]
> 
> w00t, an XTS release!
> 
> Here's a first round with 16 patches.
> 
> Patches are available in the warnings-1 branch on:
>   git://anongit.freedesktop.org/~kibi/xts

Thanks, Cyril!  Merged with bce8696..1b84405, though I squashed a few of
your more similar changes:

Cyril Brulebois (7):
      configure: Quote argument to m4_pattern_forbid.
      xts5: Fix missing type specifiers.
      xts5: Fix missing string.h include.
      xts5: Fix missing unistd.h includes.
      xts5: Return a dummy value.
      xts5: Add parentheses around assignment in an if.
      xts5: Fix implicit declaration.

Walter, I think your suggestions can be applied as separate changes.

-- Aaron