am: fix patch format detection for Thunderbird "Save As" emails

diff --git a/compat/win32.h b/compat/win32.h
index c26384e595b4f23d5fef938b1136cc3a85469e56..8ce91048deffc17bdf8d51672ddaa0c867052ac5 100644 (file)
--- a/compat/win32.h
+++ b/compat/win32.h
@@ -1,5 +1,10 @@
+#ifndef WIN32_H
+#define WIN32_H
+
 /* common Win32 functions for MinGW and Cygwin */
+#ifndef WIN32         /* Not defined by Cygwin */
 #include <windows.h>
+#endif
 
 static inline int file_attr_to_st_mode (DWORD attr)
 {
@@ -32,3 +37,5 @@ static inline int get_file_attr(const char *fname, WIN32_FILE_ATTRIBUTE_DATA *fd
                return ENOENT;
        }
 }
+
+#endif