[glibc] sunrpc: Fix netname build with older gcc

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0eb6b2725ba4aae73c03ac1f05c31cd2a073c99a

commit 0eb6b2725ba4aae73c03ac1f05c31cd2a073c99a
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date:   Mon Jul 24 14:15:23 2023 -0300

    sunrpc: Fix netname build with older gcc
    
    The -Wformat-overflow was added by gcc 8.
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 sunrpc/netname.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sunrpc/netname.c b/sunrpc/netname.c
index d9d82501b0..9e2f78329e 100644
--- a/sunrpc/netname.c
+++ b/sunrpc/netname.c
@@ -52,10 +52,14 @@ user2netname (char netname[MAXNETNAMELEN + 1], const uid_t uid,
   /* GCC with -Os or -O1 warns that sprint might overflow while handling
      dfltdom, however the above test does check if an overflow would
      happen.  */
+#if __GNUC_PREREQ (8, 0)
   DIAG_PUSH_NEEDS_COMMENT;
   DIAG_IGNORE_NEEDS_COMMENT (8, "-Wformat-overflow");
+#endif
   sprintf (netname, "%s.%d@%s", OPSYS, uid, dfltdom);
+#if __GNUC_PREREQ (8, 0)
   DIAG_POP_NEEDS_COMMENT;
+#endif
   i = strlen (netname);
   if (netname[i - 1] == '.')
     netname[i - 1] = '\0';