libraries: add Open-CAS/ocf

This library is particularly interesting because it's *intended* to be
embedded, and it's used in high-profile projects like ceph.

.gitmodules

@@ -237,3 +237,6 @@
 [submodule "libraries/aom"]
 	path = libraries/aom
 	url = https://aomedia.googlesource.com/aom/
+[submodule "libraries/ocf"]
+	path = libraries/ocf
+	url = https://github.com/Open-CAS/ocf/

config.py

@@ -820,6 +820,38 @@ def sparse_paths(self):
         "src/shrpx_connection_handler.cc",
         "src/http2.cc",
         ]),
+    Library('ocf', [
+        "src/mngt/ocf_mngt_cache.c",
+        "src/metadata/metadata.c",
+        "src/engine/engine_common.c",
+        "src/mngt/ocf_mngt_flush.c",
+        "src/ocf_core.c",
+        "src/mngt/ocf_mngt_core.c",
+        "src/ocf_request.h",
+        "src/metadata/metadata_io.c",
+        "src/utils/utils_cleaner.c",
+        "src/utils/utils_alock.c",
+        "inc/ocf_mngt.h",
+        "src/concurrency/ocf_cache_line_concurrency.c",
+        "src/ocf_lru.c",
+        "src/ocf_cache_priv.h",
+        "src/ocf_cache.c",
+        "src/engine/engine_discard.c",
+        "src/mngt/ocf_mngt_common.c",
+        "src/cleaning/acp.c",
+        "src/metadata/metadata_raw_dynamic.c",
+        "src/metadata/metadata_superblock.c",
+        "src/engine/engine_rd.c",
+        "src/cleaning/alru.c",
+        "src/engine/engine_pt.c",
+        "src/metadata/metadata_raw.c",
+        "env/posix/ocf_env.h",
+        "src/engine/engine_wb.c",
+        "src/engine/engine_wi.c",
+        "src/metadata/metadata_structs.h",
+        "src/engine/engine_wt.c",
+        "src/concurrency/ocf_cache_line_concurrency.h",
+        ]),
     Library('openjpeg', [
         "src/lib/openjp2/j2k.c",
         "src/lib/openjp2/tcd.c",