Warning in lib/malloc.c

[Eli Zaretskii]

Recent update from Gnulib causes the following compilation warning
when building with MinGW:

  malloc.c:32:1: warning: no previous prototype for 'rpl_malloc' 
[-Wmissing-prototypes]
     32 | rpl_malloc (size_t n)
        | ^~~~~~~~~~

I'm guessing that this is because nt/gnulib-cfg.mk does

  OMIT_GNULIB_MODULE_malloc-posix = true
  OMIT_GNULIB_MODULE_realloc-gnu = true
  OMIT_GNULIB_MODULE_realloc-posix = true

and thus does not include (and probably doesn't generate) some Gnulib
header.  I also think that the MinGW build should not compile
malloc.c, as I've seen no callers of rpl_malloc.  So maybe
nt/gnulib-cfg.mk should also do

  OMIT_GNULIB_MODULE_malloc-gnu = true

?  If you agree, I will make that change.

Thanks.