workaround clang problem

Using MZ_INLINE on scheme_get_realint_val() and
scheme_get_unsigned_realint_val() leads to a link
error when using the current clang on Mac OS X 10.9.
Remove the MZ_INLINE declaration, since a modern C
compiler will inline, anyway.
fix some test properties/submodules

Mostly, revert accidentally removed ".scm" and ".ss" entries.
suppress clang warnings

The warnings need to be suppressed only when compiling preprocessed
code during 3m compilation (because clang doesn't complain about
the relevant patterns when it knows that macros produced them).
fix ordering bug in place termination

This bug was introduced in 94771f16ed, moving a local-variable
initialization to after its use.