No output when parsing -Dxyz...
Linux crt + Elf interp. paths
Fixed ucc linker argument ordering
libc static library target + configure for local ucc lib
Added begin.o / __libc_start_main for crt/libc dependancy chain

When linking archives, unresolved references in an archive must appear
later on the linker's argv. Thus we can't have environ/__progname in
crt.a. So crt calls __libc_start_main in begin.o/libc.a.
Added linker test + note about __progname/environ