PAX: fixed linker warning, part 1.

--- kernel.debug ---
linking kernel.debug
kern_segvguard.o: warning: multiple common of
`sysctl__security_pax_children'
kern_pax.o: warning: previous common is here
pax_generic.o: warning: multiple common of
`sysctl__security_pax_children'
kern_pax.o: warning: previous common is here
   text    data     bss     dec     hex filename
   6632260  502048 2723384 9857692  966a9c kernel.debug

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX ASLR/SEGVGUARD: refactor to fix linker error, part 2.

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX: fixed linker warning, part 3.

--- kernel.debug ---
linking kernel.debug
kern_segvguard.o: warning: multiple common of
`sysctl__security_pax_children'
kern_pax.o: warning: previous common is here
pax_generic.o: warning: multiple common of
`sysctl__security_pax_children'
kern_pax.o: warning: previous common is here
   text    data     bss     dec     hex filename
   6632260  502048 2723384 9857692  966a9c kernel.debug

after the fix:

--- kernel.debug ---
linking kernel.debug
   text    data     bss     dec     hex filename
   6632228  501888 2723384 9857500  9669dc kernel.debug
   --- kernel.symbols ---
   objcopy --only-keep-debug kernel.debug kernel.symbols
   --- kernel ---
   objcopy --strip-debug --add-gnu-debuglink=kernel.symbols kernel.debug
   kernel
   --------------------------------------------------------------
   >>> Kernel build for OP-ASLR completed on Mon Apr 14 00:50:05 CEST
   >>> 2014
   --------------------------------------------------------------

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>