since we are adding swap - we don't need to remove optimisation from the Makefile for 256M pi's. It wasn't working
anyway since the default cflags for retropie-setup add -O2
added function to add/remove swap for building packages that need additional without messing with the users system dphys-swapfile config.
has a limit parameter so you can add swap if system ram is less than a chosen value
changed - unlikely that we need a swapfile for fbalibretro - removing the -j4 should suffice
use physical and swap space in memory calulation for adding additional swap. No need to add swap if the user already has plenty
replace previous swap on/off with the new code. the "limits" might need tweaking. But hopefully we can find a balance between
the need to add additional swap based on the users machine and existing swap set up.
changed: use megabytes for both rpSwap memory parameters
we will add swap if memory is less than the limit, not less or equal
Merge pull request #513 from petrockblog/memory

Memory/swap changes