jobserver: Split up the big try: block

The parsing of jobserver options is done in a massive try: block that hides
problems and (perhaps) bugs.  Split up that block and make the logic
explicit by moving the initial parsing of MAKEFLAGS out of that block.  Add
warnings in the places things can go wrong.

Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

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