COMP: OTB_USE_PQXX compilation macro is not used anywhere in the code

CMake/ImportPqxx.cmake

@@ -7,7 +7,6 @@ IF(OTB_USE_PQXX)
   FIND_PACKAGE(Pqxx)
   IF(PQXX_FOUND)
     MESSAGE(STATUS "Activating Pqxx support")
-    ADD_DEFINITIONS(-DOTB_USE_PQXX)
   ELSE(PQXX_FOUND)
     # Generate an error if no external Pqxx is available
     MESSAGE(FATAL_ERROR "Pqxx required but not found. "

CMake/UseOTB.cmake.in

@@ -240,7 +240,6 @@ IF(OTB_USE_PQXX)
                         "Cannot find PQXX include directory. Please set PQXX_INCLUDE_DIR or SET OTB_USE_PQXX OFF.")
         ENDIF (NOT PQXX_INCLUDE_DIR)
 
-
         FIND_LIBRARY(PQXX_LIBRARY pqxx )
         MARK_AS_ADVANCED(PQXX_LIBRARY)
         IF (NOT PQXX_LIBRARY)
@@ -255,10 +254,6 @@ IF(OTB_USE_PQXX)
                         "Cannot find PQ library. Please set PQ_LIBRARY or SET OTB_USE_PQXX OFF.")
         ENDIF (NOT PQ_LIBRARY)
 
-
-        # Add compiler option
-        ADD_DEFINITIONS(-DOTB_USE_PQXX)
-
         INCLUDE_DIRECTORIES(${PQXX_INCLUDE_DIR})
 
 ENDIF(OTB_USE_PQXX)