Add --max-res-version flag to aapt.

aapt will ignore any versioned resource directories over the
specified version (if used).  e.g. --max-res-version=6 will
cause layout-land-v7 to be ignored.

Merged from froyo.

Change-Id: Ia4eabae535b95b75d18b0c83135d44ed9a95b9eb