Add src directory in include paths

`util/print.c` was flipping out that it couldn't find `laco.h` but for
some reason it can find `util.h`. So I'm just adding it to keep the
compiler from complaining and build.

Author: sourrust

src/CMakeLists.txt

@@ -1,6 +1,6 @@
 set(DEPS_DIR "${laco_SOURCE_DIR}/deps")
 
-include_directories("${DEPS_DIR}/linenoise")
+include_directories("${laco_SOURCE_DIR}/src" "${DEPS_DIR}/linenoise")
 
 set(SOURCE ${DEPS_DIR}/linenoise/linenoise.c
            main.c util.c util/print.c