Enabling build for 64bit architectures

The C++ runtime can now be build for 32 and 64 bit architectures.
Therefore the respective CMakefiles have been changed and the
getHashCode() method has been replaced by a real hash function instead
the usage of the this pointer.

Change-Id: Ifbe5565efd7d53c2bb21329e332b8df3133450a4

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1550131 13f79535-47bb-0310-9956-ffa450edef68