MDEV-17009 PIE issue on FreeBSD after 10.3.9 update

Followup for 96b89090. Only link mysqld with
${INTERFACE_LIBS} using LINK_PUBLIC, everything else should be
using LINK_PRIVATE. This restores pre-96b89090 behavior.

Also fixes
MDEV-17010 Multiple definition issue on FreeBSD after 10.3.9 update

sql/CMakeLists.txt

@@ -279,7 +279,7 @@ IF(APPLE)
   # Add CoreServices framework since some dloadable plugins may need it 
   FIND_LIBRARY(CORESERVICES NAMES CoreServices) 
   IF(CORESERVICES) 
-    TARGET_LINK_LIBRARIES(mysqld ${CORESERVICES}) 
+    TARGET_LINK_LIBRARIES(mysqld LINK_PRIVATE ${CORESERVICES})
   ENDIF() 
 ENDIF() 
 
@@ -300,7 +300,7 @@ IF(NOT WITHOUT_DYNAMIC_PLUGINS)
   ENDIF()
 ENDIF(NOT WITHOUT_DYNAMIC_PLUGINS)
 
-TARGET_LINK_LIBRARIES(mysqld sql)
+TARGET_LINK_LIBRARIES(mysqld LINK_PRIVATE sql)
 
 # Provide plugins with minimal set of libraries
 SET(INTERFACE_LIBS ${LIBRT})