tor/changes/signof_enum

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o Code simplifications and refactoring:
- Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
the signs of types during autoconf. This is better than our old
approach, which didn't work when cross-compiling.
- Detect the sign of enum values, rather than assuming that MSC is the
only compiler where enum types are all signed. Fix for bug 7727;
bugfix on 0.2.4.10-alpha.