pull in some simple Makefile.in changes (also tag "1.3")

[jhgit]

I committed a couple changes to fix some build warnings and potential build errors for parallel builds.

See also issue 16 of devttys0/libmpsse repo.

Also I tagged the changeset that is the same as the original googlecode 1.3 code. Please also pull that tag (github doesn't have web api for viewing / pulling tags, so that will require accessing my repo with plain git).

Added stdlib.h include in support.c as well (fixes missing prototype on some platforms that don't get it from header pollution with string.h include that's already there).