Tne only place that really needs the rtlsdr headers/libs is dump1090.c
itself. There is a dependency on rtlsdr_dev_t in the shared Modes
struct in dump1090.h, but this is a pointer type so we can just
use a dummy struct definition there to avoid the header dependency.
This lets us build faup1090 (for the piaware package) without
needing a useless librtlsdr-dev build-time dependency.
Create separate makefiles for dump1090, view1090 and ppup1090. These can
be run with the command line "make -f makedump1090", "make -f
makeview1019" and "make -f makeppup1090"
Pass dump1090 version number into ppup1090 uploader so that coaa1090.obj
doesn't need re-compiling between versions.
Remove ppup1090 from general Makefile - it's not intended for anything
other than RPi, so gives linker errors on other (non Linux raspian)
systems.
Oliver Jowett
Malcolm Robb