Froyo-specific startcts Fixes

Bug 4128048

Froyo doesn't include a prebuild ddmlib, so add back the
statements to require the SDK_ROOT variable to be set.
However, keep the code that checked SDK_ROOT/tools and
SDK_ROOT/platform-tools that was patched in.

Change-Id: Ie1eedcb66d4004df2d9011688c29febf0b13446f
1 file changed