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kotlinlang

I've installed this lib (<https://github.com/eclipse/paho.mqtt.c>) and it's files are:

```
$ ls /usr/local/lib

libpaho-mqtt3a.so    libpaho-mqtt3a.so.1.0  libpaho-mqtt3as.so.1    libpaho-mqtt3c.so    libpaho-mqtt3c.so.1.0  libpaho-mqtt3cs.so.1
libpaho-mqtt3a.so.1  libpaho-mqtt3as.so     libpaho-mqtt3as.so.1.0  libpaho-mqtt3c.so.1  libpaho-mqtt3cs.so     libpaho-mqtt3cs.so.1.0

$ ls /usr/local/include

MQTTAsync.h  MQTTClient.h  MQTTClientPersistence.h
```

I want to use it in my K/N app, like here: <https://www.eclipse.org/paho/files/mqttdoc/MQTTClient/html/pubsync.html>.

`mqtt.def` that I created is:

```
headers = MQTTClient.h MQTTClientPersistence.h
compilerOpts.linux = -I/usr/local/include
linkerOpts.linux = -L/usr/local/lib -lpaho-mqtt3c
```

And the non-working (fails with Kotlin NPE) bit of config from CMake is:

```
konanc_library_search(paho-mqtt3c MQTTClient.h)
cinterop(
        NAME mqtt
        DEF_FILE mqtt.def
        COMPILER_OPTS "-I ${PAHO_MQTT3C_INCLUDE_DIR}"
)
```

In Gradle I used a config like this:

```
interop("mqtt") {
	target("linux") {
		includeDirs("/usr/local/include")
	}
}
```

And it worked, but IntelliJ IDEA has no autocompletion for generated `mqtt.kt`, so I decided to try CLion. How can I include the lib? I guess I need to tell it the path to search the header, but I don't know how to do that in CMake...