[r22832]Compile md5.c with "-fno-strict-aliasing".
The function md5_finish_ctx dereferences type-punned pointers which
breaks strict aliasing rules.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/branches/2.4@23682 57a11ea4-9604-0410-9ed3-97b8803252fd