Fix gdb python support for Android platform debugging

GDB with python support looks for specfic set of locations for PYTHONHOME.
Add one more clue to find $ANDROID_BUILD_TOP/prebuilts/python/linux-x86/2.7.5
Note that ANDROID_BUILD_TOP is set by doing usual setup in Android development,
ie.

  . build/envsetup.sh
  lunch ...

Change-Id: I95f40335768ff937a496e5a8f33be3e438ce5d8c
1 file changed