include: implement PACKED macro for winelib apps

[André Hentschel]

doesnt hurt wine but makes it easier to compile winelib apps from windows sources
---
 include/windef.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/windef.h b/include/windef.h
index 8f5ea30..a0894e2 100644
--- a/include/windef.h
+++ b/include/windef.h
@@ -127,6 +127,14 @@ extern "C" {
 #define _cdecl      __ONLY_IN_WINELIB(__cdecl)
 #endif
 
+#ifndef PACKED
+# ifdef __GNUC__
+#  define PACKED    __ONLY_IN_WINELIB(__attribute__((packed)))
+# else
+#  define PACKED    __ONLY_IN_WINELIB(/* nothing */)
+# endif
+#endif
+
 #ifndef near
 #define near        __ONLY_IN_WINELIB(/* nothing */)
 #endif
-- 

Best Regards, André Hentschel