sdl-sound: add some mirrors
alsa-lib: fix build error on i386
add scons
openal: add pkgconfig file
update python pathsearch patch to return proper prefix in more cases

python -c 'import sys; print sys.prefix'
did report the broken DESTDIR+prefix combination, which broke the
build of the libxml2 python plugin.

the strstr("python") hack which was intended to use the idiotic
argv0 logic only when no local python is installed yet (i.e.
the python interpreter is called during build of itself/its base
packages before it gets installed), didnt work out as expected
since the argv0 path contained /bin/../opt/python.
libxml2: build python wrappers, needed for mesa build
bump xcb to latest
libpciaccess: bump to latest
libdrm: bump to latest
libxdamage: bump to latest
add mesalib for openGL support
add mesaglut (does nothing so far)
add glu