Add init.environ.rc to installclean
Add init.environ.rc to installclean

BOOTCLASSPATH needs to be rebuilt when switching between build
targets.

Bug: 13282187

Change-Id: I16816abb4246878a60e1aa8c91b6b38c7339950e
Signed-off-by: Adam Hampson <212249a886b17c8f4cf1d00c96c56236e54a6960@google.com>

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build