Removing loss of precision warning in EtchHashTable

The number of entries (count()) is dependend on the platform (32, 64 bit).
The getter is changed accordingly.

Change-Id: I1c1047a28eb822a171f8841026823cb45aa7ebb8

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1584590 13f79535-47bb-0310-9956-ffa450edef68