We are building only a UNW_LOCAL_ONLY build of `test-nocalloc', and the
"generic" build would not be very interesting. Roll the whole test into
`Ltest-nocalloc.c'.
We'd like to avoid calls to all malloc related functions
so libunwind is still usable from such allocators.
Signed-off-by: Paul Pluzhnikov <ppluzhnikov@google.com>