rootfs.py refactoring.

Switch to bzip2 packages
Move most of the preprocessing done by rootfs.py
into kaem and bash scripts inside live-bootstrap.

sysa/coreutils-5.0/coreutils-5.0.kaem

@@ -8,10 +8,11 @@
 
 set -ex
 
-mkdir build
+mkdir build src
 cd build
 
 # Extract
+cp ${sources}/${pkg}.tar.bz2 ../src/
 bunzip2 -f ../src/${pkg}.tar.bz2
 tar xf ../src/${pkg}.tar
 cd ${pkg}
@@ -33,6 +34,7 @@ make -f Makefile PREFIX=${prefix}
 make -f Makefile PREFIX=${prefix} install
 
 cd ../..
+rm -r src/
 
 # Checksums
 sha256sum -c checksums