ENH: add correct initial flags for aix

Modules/Platform/AIX.cmake

@@ -26,4 +26,8 @@ ELSE(CMAKE_COMPILER_IS_GNUCC)
   SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "-Wl,-brtl,-bexpall")  # +s, flag for exe link to use shared lib
   SET(CMAKE_SHARED_LIBRARY_C_FLAGS " ")
   SET(CMAKE_SHARED_MODULE_C_FLAGS  " ")
+  SET (CMAKE_C_FLAGS_DEBUG_INIT "-g")
+  SET (CMAKE_C_FLAGS_RELEASE_INIT "-O -DNDEBUG") 
+  SET (CMAKE_C_FLAGS_MINSIZEREL_INIT "-O -DNDEBUG")
+  SET (CMAKE_C_FLAGS_RELWITHDEBINFO_INIT "-g")
 ENDIF(CMAKE_COMPILER_IS_GNUCC)