[PATCH] ntdll: Replicate InterlockedCompareExchange64 to the Unix library.

[Gerald Pfeifer]

Between Wine 5.9 and 5.10 many ntdll functions moved to the Unix
library. Make the implementation of InterlockedCompareExchange64 via
RtlInterlockedCompareExchange64 available there as well for targets
without __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8.

This fixes the build on FreeBSD/i386 with GCC 9.

Signed-off-by: Gerald Pfeifer <gerald(a)pfeifer.com>
---
 dlls/ntdll/unix/unix_private.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dlls/ntdll/unix/unix_private.h b/dlls/ntdll/unix/unix_private.h
index a422fd825e..a0485b411d 100644
--- a/dlls/ntdll/unix/unix_private.h
+++ b/dlls/ntdll/unix/unix_private.h
@@ -23,6 +23,10 @@
 
 #include "unixlib.h"
 
+#ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+#define InterlockedCompareExchange64(dest,xchg,cmp) RtlInterlockedCompareExchange64(dest,xchg,cmp)
+#endif
+
 struct debug_info
 {
     unsigned int str_pos;       /* current position in strings buffer */
-- 
2.25.0