PAX ASLR/SEGVGUARD: Fix compiler warnings, breaking build on sparc64

+ style(9) fixes by Oliver
PAX: simplify pax_elf logic and fix typo

style(9) and remove unneeded Makefile magic from commit by Oliver
PAX SEGVGUARD: simplify pax_segvguard()'s logic

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX: merge two if level into one

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