Add cmake support

client/deps/jansson.cmake

@@ -0,0 +1,18 @@
+set_property(SOURCE PROPERTY C_STANDARD 99)
+add_definitions(-DHAVE_STDINT_H)
+include_directories(jansson)
+
+add_library(jansson
+        jansson/dump.c
+        jansson/error.c
+        jansson/hashtable.c
+        jansson/hashtable_seed.c
+        jansson/load.c
+        jansson/memory.c
+        jansson/pack_unpack.c
+        jansson/strbuffer.c
+        jansson/strconv.c
+        jansson/utf.c
+        jansson/path.c
+        jansson/value.c
+)