Fix jsoncpp -> JSONCPP

Author: kpeeters

client_server/CMakeLists.txt

@@ -21,7 +21,7 @@ find_package(Threads REQUIRED)
 find_package(Boost 1.53.0 COMPONENTS system program_options date_time filesystem REQUIRED)
 if(ENABLE_SYSTEM_JSONCPP)
   message("-- Linking against system-provided jsoncpp")
-  find_package(jsoncpp REQUIRED)
+  find_package(JSONCPP REQUIRED)
 else()
   message("-- Linking against included jsoncpp")
 endif()