BUILD/MINOR: 51d: fix warning when building with 51Degrees release version 3.2.12.12

The warning appears when building with 51Degrees release that uses a new
Hash Trie algorithm (release version 3.2.12.12):

src/51d.c: In function init_51degrees:
src/51d.c:566:2: warning: enumeration value DATA_SET_INIT_STATUS_TOO_MANY_OPEN_FILES not handled in switch [-Wswitch]
  switch (_51d_dataset_status) {
  ^

This patch can be backported in 1.7.
1 file changed