davfs2: Update to 1.5.5

Switched URL to @SAVANNAH for more mirrors.

Added PKG_BUILD_PARALLEL for faster compilation.

Added PKG_LICENSE info.

Minor reorganization for consistency between packages.

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

net/davfs2/patches/010-main_code_fix.patch

@@ -1,17 +1,6 @@
---- a/src/cache.c
-+++ b/src/cache.c
-@@ -58,7 +58,7 @@
- #ifdef HAVE_SYS_TYPES_H
- #include <sys/types.h>
- #endif
--#include <sys/xattr.h>
-+#include <linux/xattr.h>
- 
- #include <ne_alloc.h>
- #include <ne_string.h>
 --- a/src/webdav.c
 +++ b/src/webdav.c
-@@ -2033,7 +2033,7 @@ ssl_verify(void *userdata, int failures,
+@@ -2037,7 +2037,7 @@ ssl_verify(void *userdata, int failures, const ne_ssl_certificate *cert)
              len = getline(&s, &n, stdin);
              if (len < 0)
                  abort();