Bug#55647:CMake build rebuilds some libraries twice for embedded

A  simple version of the patch : add WITH_PIC to debug compilation.

Engines that are not dependent on internal stuff (like THD structure) 
will not be recompiled for embedded in debug mode.

Examples of such engines are : archive, federated, innodb. Engines
with dependencies on internals (myisam,heap,myisammrg) will still be 
fully recompiled.

CMakeLists.txt

@@ -61,6 +61,11 @@ SET(BUILDTYPE_DOCSTRING
  
 IF(WITH_DEBUG)
   SET(CMAKE_BUILD_TYPE "Debug" CACHE STRING ${BUILDTYPE_DOCSTRING} FORCE)
+  IF(UNIX AND NOT APPLE)
+    # Compiling with PIC speeds up embedded build, on PIC sensitive systems 
+    # Predefine it to ON, in case user chooses to build embedded. 
+    SET(WITH_PIC ON CACHE BOOL "Compile with PIC")
+  ENDIF()
   SET(OLD_WITH_DEBUG 1 CACHE INTERNAL "" FORCE)
 ELSEIF(NOT HAVE_CMAKE_BUILD_TYPE OR OLD_WITH_DEBUG)
   IF(CUSTOM_C_FLAGS)