eat: get the proper MODVERSION

* The version in system/build.prop might be
  different than what the zip is named on incremental
  builds.
* Use CM_VERSION from the build system instead.

Conflicts:
	envsetup.sh

Change-Id: If4508921d8fd05219a2f358a2397a13b247065bd
Signed-off-by: Chirayu Desai <cdesai@cyanogenmod.org>

Conflicts:
	envsetup.sh
envsetup: use $(CURDIR) for getting current directory

Change-Id: I5f00faf64ec31d86dd2e48ec038748ce8499380b