wimlib: fix build on musl

srcpkgs/wimlib/patches/musl-fs.patch

@@ -0,0 +1,10 @@
+--- a/src/mount_image.c
++++ b/src/mount_image.c
+@@ -52,6 +52,7 @@
+ #include <sys/time.h>
+ #include <unistd.h>
+ #include <utime.h>
++#include <linux/fs.h>
+ 
+ #include "wimlib/blob_table.h"
+ #include "wimlib/dentry.h"