use libmysqlclient_r to ensure thread safety

According to
<http://dev.mysql.com/doc/refman/5.5/en/c-api-threaded-clients.html>,
(potentially) threaded clients should use the reentrant
libmysqlclient_r.  This is just a precaution, I haven't seen any
issues with the normal libmysqlclient.

Change-Id: Icb29df6dd54eb666e3b43b73fbda406acccd11cb

cmake/FindMySQL.cmake

@@ -34,7 +34,7 @@ else(MYSQL_CONFIG)
         /usr/local/mysql/include/mysql
         /usr/include
         /usr/include/mysql
-    #find_library(mysqlclient ...
+    #find_library(mysqlclient_r ...
     #    PATHS
     #    ${MYSQL_ADD_LIBRARY_PATH}
     #    /usr/lib/mysql

src/experiments/cored-voter/CMakeLists.txt

@@ -30,6 +30,6 @@ target_link_libraries(fail-${EXPERIMENT_NAME} ${PROTOBUF_LIBRARY} fail-llvmdisas
 
 ## This is the example's campaign server distributing experiment parameters
 add_executable(${EXPERIMENT_NAME}-server main.cc)
-target_link_libraries(${EXPERIMENT_NAME}-server -Wl,--start-group fail-${EXPERIMENT_NAME} fail-sal fail-util fail-cpn fail-comm ${PROTOBUF_LIBRARY} ${Boost_THREAD_LIBRARY} -lmysqlclient -Wl,--end-group)
+target_link_libraries(${EXPERIMENT_NAME}-server -Wl,--start-group fail-${EXPERIMENT_NAME} fail-sal fail-util fail-cpn fail-comm ${PROTOBUF_LIBRARY} ${Boost_THREAD_LIBRARY} -lmysqlclient_r -Wl,--end-group)
 install(TARGETS ${EXPERIMENT_NAME}-server RUNTIME DESTINATION bin)
 

src/experiments/l4-sys/CMakeLists.txt

@@ -42,5 +42,5 @@ target_link_libraries(fail-${EXPERIMENT_NAME} ${LIBUDIS86_LIBRARIES} ${PROTOBUF_
 
 ## This is the example's campaign server distributing experiment parameters
 add_executable(${EXPERIMENT_NAME}-server main.cc)
-target_link_libraries(${EXPERIMENT_NAME}-server fail-${EXPERIMENT_NAME} -Wl,--start-group fail-sal fail-util fail-cpn fail-comm ${PROTOBUF_LIBRARY} ${Boost_THREAD_LIBRARY} -lmysqlclient -Wl,--end-group)
+target_link_libraries(${EXPERIMENT_NAME}-server fail-${EXPERIMENT_NAME} -Wl,--start-group fail-sal fail-util fail-cpn fail-comm ${PROTOBUF_LIBRARY} ${Boost_THREAD_LIBRARY} -lmysqlclient_r -Wl,--end-group)
 install(TARGETS ${EXPERIMENT_NAME}-server RUNTIME DESTINATION bin)

src/experiments/weather-monitor/CMakeLists.txt

@@ -31,5 +31,5 @@ target_link_libraries(fail-${EXPERIMENT_NAME} ${PROTOBUF_LIBRARY})
 
 ## This is the example's campaign server distributing experiment parameters
 add_executable(${EXPERIMENT_NAME}-server main.cc)
-target_link_libraries(${EXPERIMENT_NAME}-server fail-${EXPERIMENT_NAME} fail fail-cpn fail-util -lmysqlclient ${PROTOBUF_LIBRARY} ${Boost_THREAD_LIBRARY})   
+target_link_libraries(${EXPERIMENT_NAME}-server fail-${EXPERIMENT_NAME} fail fail-cpn fail-util -lmysqlclient_r ${PROTOBUF_LIBRARY} ${Boost_THREAD_LIBRARY})   
 install(TARGETS ${EXPERIMENT_NAME}-server RUNTIME DESTINATION bin)