Move to a simpler versioning scheme (the one derived from upstream

is going to break the ordering that Debian expects very soon).

When building from source not via debian/rules, derive a version from
git describe.

Makefile

@@ -4,18 +4,22 @@
 #
 PROGNAME=dump1090
 
+ifndef DUMP1090_VERSION
+DUMP1090_VERSION=$(shell git describe --tags)
+endif
+
 ifdef PREFIX
 BINDIR=$(PREFIX)/bin
 SHAREDIR=$(PREFIX)/share/$(PROGNAME)
 EXTRACFLAGS=-DHTMLPATH=\"$(SHAREDIR)\"
 endif
 
+CPPFLAGS+=-DMODES_DUMP1090_VERSION=\"$(DUMP1090_VERSION)\"
 CFLAGS+=-O2 -g -Wall -Werror -W `pkg-config --cflags librtlsdr`
 LIBS=-lpthread -lm -lrt
 LIBS_RTL=`pkg-config --libs librtlsdr`
 CC=gcc
 
-
 all: dump1090 view1090
 
 %.o: %.c dump1090.h