envsetup: set OUT_DIR to an absolute path always

OUT_DIR was set to $(TOPDIR)out previously,
but $(TOPDIR) was null, so it was a relative path.
This broke releasetools, inline kernel building, etc
since they require absolute paths.
Fix it so that it is set to $(shell readlink -f .)/out
if $(TOPDIR) is null.

Also remove hacks which checked if (OUT_DIR) was out
and changed it to $(ANDROID_BUILD_TOP)/out to workaround
the aforementioned problem.

Change-Id: I459a3b1325a1bbea0565cd73f6acf160d4ed9b39
build: add support for uncompressed kernels
build: add strip on kernel modules

kernel modules are huge for prima wlan and we need to strip them
unstriped size 40mb
striped size 2mb

Change-Id: Iefd572732cad0a6f608439618673068a3586fcd5
kernel: Ignore errors with module building

Let kernel fully disable loadable modules

Change-Id: Ia37ec927b092c041ee4c68bf9fd0f28b7339c8ca