PAX Segvguard: fix build without PAX_ASLR

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX Segvguard: style(9) and notes

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX Segvguard: some segvguard related fixes

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX ASLR: style(9) in vm_mmap.c

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