Initial integration with libdeltachat

This implements configuration, connection, sending and receiving IMs in the
simplest possible way. Lots and lots of cases are not handled.

Makefile

@@ -1,17 +1,18 @@
 CC ?= gcc
 PREFIX ?= /usr/local
 
-libdelta.so: *.c *.h
+libdelta.so: *.c *.h Makefile
 	$(CC) -C \
 		-Wall -Wextra -Werror \
 		-std=c11 \
 		-shared \
 		-fpic \
-		$(shell pkg-config --cflags purple) \
+		$(shell pkg-config --cflags purple libsoup-2.4) \
 		-o libdelta.so \
 		*.c \
 		-shared \
-		$(shell pkg-config --libs purple)
+		$(shell pkg-config --libs purple libsoup-2.4) \
+		-ldeltachat
 
 clean:
 	rm libdelta.so