GnuTLS | Building crau.h (#1889)

Issue created by Bjørn Christensen: https://gitlab.com/gnutls/gnutls/-/work_items/1889



## Description of problem:
Problems building GnuTLS on mac platform.
The code in crau.h seems to have a logic error, lines 253-261

#  ifndef CRAU_MAYBE_UNUSED
#   if defined(__has_c_attribute)
#    if __has_c_attribute (__maybe_unused__)
#     define CRAU_MAYBE_UNUSED [[__maybe_unused__]]
#    endif
#   elif defined(__GNUC__)
#    define CRAU_MAYBE_UNUSED __attribute__((__unused__))
#   endif
#  endif /* CRAU_MAYBE_UNUSED */

In my case when compiling, the code ends up without macro CRAU_MAYBE_UNUSED defined.

that generates compiler errors for all the later uses.

I have solved the problem by adding -DCRAU_MAYBE_UNUSED= to the compilation but is would be nice that  the code defined an empty macro CRAU_MAYBE_UNUSED if it cannot provide an alternative for it.

Could be:
#  ifndef CRAU_MAYBE_UNUSED
#   if defined(__has_c_attribute)
#    if __has_c_attribute (__maybe_unused__)
#     define CRAU_MAYBE_UNUSED [[__maybe_unused__]]
#    else
#     define CRAU_MAYBE_UNUSED
#    endif
#   elif defined(__GNUC__)
#    define CRAU_MAYBE_UNUSED __attribute__((__unused__))
#   else
#    define CRAU_MAYBE_UNUSED
#   endif
#  endif /* CRAU_MAYBE_UNUSED */


## Version of gnutls used:
3.8.13

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
sourcecode

## How reproducible:
everytime

Steps to Reproduce:

 * one
 * two
 * three

## Actual results:


## Expected results:

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