AOKP cleanup

cp'd from CM

- remove opticharger: it's not used any more

Change-Id: I68c86b2407486c4b40998288cf1f70b7cb8170f4
squisher: Get rid of it.
The pngcrush tool does not add any noticeable value any more, such that it justifies the extra build time: 240MB vs 238MB.
The build.prop changes are now no ops, since the key for ro.kernel.android.checkjni no longer exists.
Changing the ro.build.type from eng to user is also a no op, since CM is now userdebug.
Deleting bins is also unncessary now.
Stripping modules is also unnecessary now. (plenty of space)

At this point, I think we can just symlink $OUTFILE to $OTAPACKAGE, and not even bother
with a copy.

Change-Id: I431ac6425dedb6cd02eb2d31fc9ff82b49df9f50
squisher: link the target $OUTFILE.

Change-Id: I5d905fb12e7d5f5cbae0af85f229b29becaf33ef
squisher: force hardlink.

Change-Id: I5741918615d101d2553fb7cdd02b0c5242970bc9
squisher: Don't set the OTAPACKAGE name

Instead of setting the OTAPACKAGE name here, expect
OTAPACKAGE will be passed to us. This fixes an issue when
BUILD_NUMBER is defined in an environment with automated
builds.

Change-Id: I0634416e5332790d314f6a70313ea67821fd1331