gcc (4.4.0) issues the following warning:

    src/revobject.c:33: warning: dereferencing type-punned pointer \
        will break strict-aliasing rules

We suppress the warning by copying the first 4 bytes from the oid
structure into an 'unsigned int' using memcpy(). This will also
fix any potential alignment issues on certain platforms.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Andreas Ericsson <ae@op5.se>