Always open files in binary mode in virFDStreamOpenFileInternal

On win32, using text mode for binary files might result in short
reads since ASCII character 0x1A is interpreted as EOF. Also, it
could lead to problems using the seek functions because of the \r
handling.
Signed-off-by: NClaudio Bley <cbley@av-test.de>

src/fdstream.c

@@ -593,7 +593,7 @@ virFDStreamOpenFileInternal(virStreamPtr st,
     VIR_DEBUG("st=%p path=%s oflags=%x offset=%llu length=%llu mode=%o",
               st, path, oflags, offset, length, mode);
 
-    oflags |= O_NOCTTY;
+    oflags |= O_NOCTTY | O_BINARY;
 
     if (oflags & O_CREAT)
         fd = open(path, oflags, mode);