WIP: add a stub IRC daemon named `kike'

As it is going to share a great lot of functionality with ZyklonB, I have
decided to extract the common parts into `common.c' and make the two subprojects
include this file.

The Single Compile Unit concept has proven valuable (sub-second compile times,
dead code warnings, almost no need for function declarations, whole-program
optimizations), and the sources aren't that long so far anyway.

I am probably going to add CMake support later but so far it's not a priority.
This project is meant to be portable and freely relocatable (ie. no hardcoded
paths if I can avoid it).

Makefile

@@ -1,17 +1,20 @@
 SHELL = /bin/sh
 CC = clang
 CFLAGS = -ggdb -Wall -Wextra -std=c99
-LDFLAGS = `pkg-config --libs libssl`
+# -lpthread is only there for debugging (gdb & errno)
+LDFLAGS = `pkg-config --libs libssl` -lpthread
 
 .PHONY: all clean
 
-targets = zyklonb
+targets = zyklonb kike
 
 all: $(targets)
 
 clean:
 	rm -f $(targets)
 
-zyklonb: src/zyklonb.c src/siphash.c
-	$(CC) $^ -o $@ $(CFLAGS) $(LDFLAGS)
+zyklonb: src/zyklonb.c src/common.c src/siphash.c
+	$(CC) src/zyklonb.c src/siphash.c -o $@ $(CFLAGS) $(LDFLAGS)
+kike: src/kike.c src/common.c src/siphash.c
+	$(CC) src/kike.c src/siphash.c -o $@ $(CFLAGS) $(LDFLAGS)