next-prime: Revert to original behaviour in GNU gettext

[Bruno Haible]

When I created the module 'next-prime' two months ago, to unify code
from Gnulib and from GNU gettext, it had the side effect of changing
the size of small .mo files. This is undesired; therefore this patch
reverts to the original definition of next_prime within GNU gettext.


2025-07-12  Bruno Haible  <bruno@clisp.org>

        next-prime: Revert to original behaviour in GNU gettext.
        Reported by Rocket Aaron <i@rocka.me> at
        <https://savannah.gnu.org/bugs/?67305>.
        * lib/next-prime.c (next_prime): In GNU gettext, don't skip small
        primes.

diff --git a/lib/next-prime.c b/lib/next-prime.c
index 52cebc48d1..58630db9b0 100644
--- a/lib/next-prime.c
+++ b/lib/next-prime.c
@@ -42,9 +42,11 @@ is_prime (size_t candidate)
 size_t _GL_ATTRIBUTE_CONST
 next_prime (size_t candidate)
 {
+#if !defined IN_LIBGETTEXTLIB
   /* Skip small primes.  */
   if (candidate < 10)
     candidate = 10;
+#endif
 
   /* Make it definitely odd.  */
   candidate |= 1;