Ship openlipclua

[NiLuJe]

For koreader/koreader#12056

Pending notmarek/openlipclua#1 so we actually have a Makefile to use ;p.

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This change is 

[NiLuJe]

First time adding stuff to the revamped buildsystem, hoping I didn't forget anything @benoit-pierre ;).

[Frenzie]

I just noticed the legacy Kindle build has been failing.

openlipclua.c: In function 'check_lipc_code':
openlipclua.c:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (code != -1) {
                  ^~
openlipclua.c: In function 'openlipcluaha_to_table':
openlipclua.c:159:21: error: a label can only be part of a statement and a declaration is not a statement
                     int data;
                     ^~~
openlipclua.c:165:21: error: a label can only be part of a statement and a declaration is not a statement
                     char* data_str;
                     ^~~~
make[2]: *** [Makefile:13: openlipclua.o] Error 1

https://gitlab.com/koreader/nightly-builds/-/jobs/7220477049

[NiLuJe]

Huh. I'll look into it on Monday!