wine-fix-gcc10.mypatch

diff --git a/include/winbase.h b/include/winbase.h
index dc8aa081be4..16e1b06ef8c 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1613,6 +1613,12 @@ typedef struct _WIN32_STREAM_ID {
 } WIN32_STREAM_ID, *LPWIN32_STREAM_ID;
 #include <poppack.h>
 
+/* Fix for GCC 10 */
+#define va_start(v,l)   __builtin_va_start(v,l)
+#define va_end(v)       __builtin_va_end(v)
+#define va_arg(v,l)     __builtin_va_arg(v,l)
+#define va_copy(d,s)    __builtin_va_copy(d,s)
+typedef __builtin_va_list va_list;
 
 /* GetBinaryType return values.
  */