support of __restrict and __constructor__

[Yura Pakhuchiy <pakhuchiy@gmail.com>]

Hi,

I updated libntfs/ntfsprogs to use sparse for checking endianness.
Thanks much for this feature, it very useful. Helped to find several
bugs in our project.

The only problem is 2 annoying lines in glibc and gnupg headers that
sparse-0.3 do not like:
1. Sparse do not like __restrict_attr inside regexec() definition in
   regex.h. Relevant code:

   extern int regexec (const regex_t *__restrict __preg,
                    const char *__restrict __string, size_t __nmatch,
                    regmatch_t __pmatch[__restrict_arr],
                    int __eflags);

   Produces following error: 
   /usr/include/regex.h:543:27: error: typename in expression
   /usr/include/regex.h:543:27: error: undefined identifier '__restrict'
   /usr/include/regex.h:543:27: error: bad constant expression type

   (Note: __restrict_arr is defined to __restrict)
2. And sparse do not know about attribute __constructor__ inside
   gpg-error.h. Relevant code:

#if _GPG_ERR_GCC_VERSION > 30100
#define _GPG_ERR_CONSTRUCTOR    __attribute__ ((__constructor__))
#define _GPG_ERR_HAVE_CONSTRUCTOR
#endif
#endif

#ifndef _GPG_ERR_CONSTRUCTOR
#define _GPG_ERR_CONSTRUCTOR
#endif

/* Initialization function.  */

/* Initialize the library.  This function should be run early.  */
gpg_error_t gpg_err_init (void) _GPG_ERR_CONSTRUCTOR;

I would really happy if you will fix this. Thanks!

-- 
Best regards,
        Yura