Use UINT128_T support flag from configure

Current check for __uint128_t in hash.c is not valid, since it ignores
compilers other than gcc. We hit this on lcc on e2k platform.

Configure script properly checks from 128-bit data types support and
sets HAVE_UINT128_T accordingly. This approach is already used within
ruby at bignum.c, random.c, etc.

Probably hash.c is an overlooked remnant of old days. This patch fixes
this.

[ruby-core:84438] [Bug #14231] [Fix GH-1781]
From: Andrew Savchenko <bircoph@altlinux.org>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61471 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 1bbb6b1852..93f1685c9e 100644
--- a/hash.c
+++ b/hash.c
@@ -230,7 +230,7 @@ static const uint64_t prime2 = ((uint64_t)0xcdb32970 << 32) | 0x830fcaa1;
 static inline uint64_t
 mult_and_mix(uint64_t m1, uint64_t m2)
 {
-#if defined(__GNUC__) && UINT_MAX != ULONG_MAX
+#if defined HAVE_UINT128_T
     __uint128_t r = (__uint128_t) m1 * (__uint128_t) m2;
     return (uint64_t) (r >> 64) ^ (uint64_t) r;
 #else