make: Implement optional deps support

MrGlockenspiel / activate-linux

The "Activate Windows" watermark ported to Linux

GNU General Public License v3.0

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Closed ahmubashshir closed 8 months ago

ahmubashshir commented 8 months ago

Implements:

Selectively rebuild when previous buildenv had an optional dependency that the current buildenv doesn't have.
Allow enabling/disabling optional features.
Remove source implementing optional feature from targets (fixes compiler warning when an optional dependency is not found)

Signed-off-by: Mubashshir ahmubashshir@gmail.com