[newlib-cygwin] Fix off_t typedef on Cygwin64

[newlib-cygwin] Fix off_t typedef on Cygwin64

[Yaakov Selkowitz]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3d3ab829689f2563cfbfb65ce440cff8299a4ae9

commit 3d3ab829689f2563cfbfb65ce440cff8299a4ae9
Author: Yaakov Selkowitz <yselkowi@redhat.com>
Date:   Mon Aug 29 15:30:59 2016 -0500

    Fix off_t typedef on Cygwin64
    
    While both long and long long are 64-bits on x86_64, they are distinct types,
    and long was used prior to commit 477463a2011ba81907a753df9ce7a71b6563db54.
    Changing this breaks the linking of previously compiled C++ functions with
    off_t arguments on 64-bit Cygwin with newly compiled code, as the mangling of
    long (l) and long long (x) differ.
    
    Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

Diff:
---
 newlib/libc/include/sys/_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libc/include/sys/_types.h b/newlib/libc/include/sys/_types.h
index 4bf2bc4..98b93ce 100644
--- a/newlib/libc/include/sys/_types.h
+++ b/newlib/libc/include/sys/_types.h
@@ -94,7 +94,7 @@ typedef __uint32_t __mode_t;
 __extension__ typedef long long _off64_t;
 #endif
 
-#ifdef __CYGWIN__
+#if defined(__CYGWIN__) && !defined(__LP64__)
 typedef _off64_t __off_t;
 #else
 typedef _off_t __off_t;