Including config.h emits warnings from -Wundef

[Tim Rühsen]

Hi,

I just updated gnulib and recognized these warnings with every '#include 
<config.h>'. Before the update there were no warnings.

../config.h:3317:34: warning: "__cplusplus" is not defined, evaluates to 
0 [-Wundef]
 3317 | #if !defined HAVE_C_ALIGNASOF && __cplusplus < 201103 && 
!defined alignof
      |                                  ^~~~~~~~~~~
../config.h:3318:6: warning: "HAVE_STDALIGN_H" is not defined, evaluates 
to 0 [-Wundef]
 3318 | # if HAVE_STDALIGN_H
      |      ^~~~~~~~~~~~~~~
../config.h:3415:7: warning: "HAVE_STDALIGN_H" is not defined, evaluates 
to 0 [-Wundef]
 3415 | # if !HAVE_STDALIGN_H
      |       ^~~~~~~~~~~~~~~
../config.h:3424:6: warning: "_GL_STDALIGN_NEEDS_STDDEF" is not defined, 
evaluates to 0 [-Wundef]
 3424 | # if _GL_STDALIGN_NEEDS_STDDEF
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~

Disabling -Wundef for the whole project is not my preferred solution =).
Using a #pragma around the #include is ugly and tedious (too many files 
to change).

Can this be fixed in gnulib ?

Regards, Tim

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