envsetup: Fix $PROMPT_COMMAND

Change I200902f135d0c5c620a8eb3ce9cefdba318cf9d3 broke the android
PROMPT_COMMAND on scenarios where the existing prompt already had
a hardstatus adjustment, since appending it to Android's just clobbered
Android's in favor of the original.

So instead of appending them, inject android's at the beggining of the
existing one (and create a default if none exists)

Change-Id: I1fbcbfdb6220d886dda3662da498d1759a4c195b
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_build into cm-10.1