davfs2: update to 1.5.6

Split musl patch into multiple small ones. Much easier to reason about.

Removed stack protector patch. This is not an issue anymore.

Removed NLS support. There seems to be a linking issue as
libiconv-stub does not have a shared library component.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/davfs2/patches/040-sys-select.patch

@@ -0,0 +1,11 @@
+--- a/src/dav_fuse.c
++++ b/src/dav_fuse.c
+@@ -48,6 +48,8 @@
+ #include <sys/stat.h>
+ #endif
+ 
++#include <sys/select.h>
++
+ #include "defaults.h"
+ #include "mount_davfs.h"
+ #include "cache.h"