Generate xlat/*.in files

Automatically convert xlat structures from *.c files to xlat/*.in files
using "./generate_xlat_in.sh *.c" command.
diff --git a/xlat/xattrflags.in b/xlat/xattrflags.in
new file mode 100644
index 0000000..41d1896
--- /dev/null
+++ b/xlat/xattrflags.in
@@ -0,0 +1,2 @@
+XATTR_CREATE
+XATTR_REPLACE