Older GHCs can't parse OPTIONS_GHC.
This also changes the URL referenced for the -w options from
WorkingConventions#Warnings to CodingStyle#Warnings for the compiler
modules.

Patch from Audrey Tang.

Conservative and iterative coalescing come next.

Having a timer signal go off regularly is bad for power consumption,
and generally bad practice anyway (it means the app cannot be
completely swapped out, for example).  Fortunately the threaded RTS
already had a way to detect when the system was idle, so that it can
trigger a GC and thereby find deadlocks.  After performing the GC, we
now turn off timer signals, and re-enable them again just before
running any Haskell code.

Also noticed a few others from RtsAPI were missing, so I added them all

Arrow desugaring now uses a private version of collectPatBinders and
friends, in order to include dictionary bindings from ConPatOut.

It doesn't fix arrowrun004 (#1333), though.

this "fixes" #1038, in that the example runs in constant space, but
it's really only working around the problem.  I have a better patch,
attached to ticket #1038, but I'm wary about tinkering with this
notorious bug farm so close to the release, so I'll push it after
6.8.1.

I had planned to do findEnclosingDecl a different way, so add a ToDo
as a reminder.

Older autoconfs (<2.60?) don't understand them.

M ./libraries/Makefile +2

M ./libraries/Makefile -3 +3

I think this fixes #1209

Previously:

outofmem.exe: getMBlocks: VirtualAlloc MEM_RESERVE 1025 blocks failed: Not enoug
h storage is available to process this command.

Now:

outofmem.exe: out of memory

We don't need fixed Names for NDP built-ins. Instead, we can look them up
ourselves during VM initialisation.