krb5 commit [krb5-1.18]: Make fiat 128-bit typedefs work with older gcc

[Greg Hudson]

https://github.com/krb5/krb5/commit/411366f9396d63147c4bc433aff42b9554d4d6be
commit 411366f9396d63147c4bc433aff42b9554d4d6be
Author: Greg Hudson <ghudson at mit.edu>
Date:   Tue Mar 24 02:00:25 2020 -0400

    Make fiat 128-bit typedefs work with older gcc
    
    Use the int128_t and uint128_t types defined by edwards25519.c, rather
    than [un]signed __int128 which does not compile with gcc 4.4.
    Reported by Norm Green.
    
    (cherry picked from commit dd5d6e5e39be6cf7fe9d54a79e824f8cb7301177)
    
    ticket: 8888
    version_fixed: 1.18.1

 src/plugins/preauth/spake/edwards25519.c      |    4 +++-
 src/plugins/preauth/spake/edwards25519_fiat.h |    4 ++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/plugins/preauth/spake/edwards25519.c b/src/plugins/preauth/spake/edwards25519.c
index cbc26e5..2039411 100644
--- a/src/plugins/preauth/spake/edwards25519.c
+++ b/src/plugins/preauth/spake/edwards25519.c
@@ -68,7 +68,9 @@
  *   generation.  The fiat_25519_selectznz and fiat_25519_carry_scmul_121666
  *   functions were removed from both branches as they are not used here (the
  *   former because it is not used by the BoringSSL code and the latter because
- *   it is only used by the X25519 code).
+ *   it is only used by the X25519 code).  The fiat_25519_int128 and
+ *   fiat_25519_uint128 typedefs were adjusted to work with older versions of
+ *   gcc.
  *
  * - fe_cmov() has the initial "Silence an unused function warning" part
  *   removed, as we removed fiat_25519_selectznz instead.
diff --git a/src/plugins/preauth/spake/edwards25519_fiat.h b/src/plugins/preauth/spake/edwards25519_fiat.h
index b61cb49..48ade92 100644
--- a/src/plugins/preauth/spake/edwards25519_fiat.h
+++ b/src/plugins/preauth/spake/edwards25519_fiat.h
@@ -11,8 +11,8 @@
 #include <stdint.h>
 typedef unsigned char fiat_25519_uint1;
 typedef signed char fiat_25519_int1;
-typedef signed __int128 fiat_25519_int128;
-typedef unsigned __int128 fiat_25519_uint128;
+typedef int128_t fiat_25519_int128;
+typedef uint128_t fiat_25519_uint128;
 
 
 /*