amd64-x32 ABI defines sizeof(long) == sizeof (void*) == 4

Noticed on build failure of libXmu:
  libXmu-1.1.0/work/libXmu-1.1.0/src/EditresCom.c: In function 
'_XEditresGetStringValues':
  libXmu-1.1.0/work/libXmu-1.1.0/src/EditresCom.c:2198:6: error: duplicate case 
value
  libXmu-1.1.0/work/libXmu-1.1.0/src/EditresCom.c:2194:6: error: previously 
used here

More info about x32: https://sites.google.com/site/x32abi/

Signed-off-by: Sergei Trofimovich <[email protected]>
---
Change since v1:
- x32 got __ILP32__ and _ILP32 defines
  allowing result be more generic
 Xmd.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/Xmd.h b/Xmd.h
index f3868b3..96cc08f 100644
--- a/Xmd.h
+++ b/Xmd.h
@@ -64,7 +64,9 @@ SOFTWARE.
      defined(__s390x__) || \
      defined(__amd64__) || defined(amd64) || \
      defined(__powerpc64__)
-#  define LONG64                               /* 32/64-bit architecture */
+#  if !defined(__ILP32__) /* amd64-x32 is 32bit */
+#   define LONG64                              /* 32/64-bit architecture */
+#  endif /* !__ILP32__ */
 # endif
 
 /*
-- 
1.7.8.6

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