Development: Show up new qualifier

Due that TRDS is now a real qualifier show it
up in configuration

Change-Id: Ibdce27492a6208d046dd6f7faca03f6cec2b72c5
"debug" in those modules is discouraged

Because we need those modules for only emulator builds.
If you mark them as "debug", you'll get them even if you are doing a
real device userdebug/eng build.
Instead, we should add their module names to the emulator product config
in build/target/product/emulator.mk.

Bug: 8276818
Change-Id: I58988ce49804583b06e7d93380c44ba800448216
Add support for cross compiling Windows tools on Darwin.

Change-Id: Iba04ca9cc02f4b7059fcfb8362373a72e0365be8
Fix up Windows cross compile detection and error handling on Darwin.

Change-Id: Iaa0e3aa64340e31c357a60bc774d9a4ec8174f62