[MMD] Reverted incorrect part of r32189, the refactoring of multi_sig caching out of mmd_dispatch().  As reported by Carl Mäsak in RT #60178, this broke the build on Mac OS X.
[MMD] Reverted incorrect part of r32189, the refactoring of multi_sig caching
out of mmd_dispatch().  As reported by Carl Mäsak in RT #60178, this broke the
build on Mac OS X.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@32347 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot