stdenv: fix stage1 gettext build (with gcc14)

Add the same trick for gettext as for libunistring below, skipping
"checking for working iconv" which requires locales and gconv modules
(and other stuff we don't have in bootstrapTools?)

It tries to run the following check in `iconv.m4` which fails:

```c
#include <iconv.h>
#include <string.h>

int
main (void)
{
int result = 0;

  /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
     provided.  */
  {
    /* Try standardized names.  */
    iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
    /* Try IRIX, OSF/1 names.  */
    iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
    /* Try AIX names.  */
    iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
    /* Try HP-UX names.  */
    iconv_t cd4 = iconv_open ("utf8", "eucJP");
    if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
        && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
      result |= 16;
    if (cd1 != (iconv_t)(-1))
      iconv_close (cd1);
    if (cd2 != (iconv_t)(-1))
      iconv_close (cd2);
    if (cd3 != (iconv_t)(-1))
      iconv_close (cd3);
    if (cd4 != (iconv_t)(-1))
      iconv_close (cd4);
  }
  return result;

  ;
  return 0;
}
```

Then it assumes iconv is not there and tries to use some built-in iconv
function? idk

Resulting in following error:

```
iconv-ostream.c:311:3: error: initialization of 'void (*)(struct
any_ostream_representation *, ostream_flush_scope_t)' from incompatible
pointer type 'void (*)(struct any_ostream_representation *)' []
```

This isn't causing a build failure in other architectures because we
haven't updated bootstrapTools to gcc14, so the error isn't noticeable,
but it's there. Check https://hydra.nixos.org/build/294707390/nixlog/10

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