abc, abc9_exe: respect -q when built with linked ABC

[whitequark]

This is mostly important for YoWASP builds, since those do not have a way to build with external ABC (I prototyped it but for some reason ABC always segfaults when built as an independent Wasm binary...)

[whitequark]

For context, right now using yowasp-yosys -q results in this:

$ yowasp-yosys -q test.v -p synth_ice40
ABC command line: "source /tmp/yosys-abc-000000/abc.script".

+ read_blif /tmp/yosys-abc-000000/input.blif
+ read_lut /tmp/yosys-abc-000000/lutdefs.txt
+ strash
+ &get -n
+ &fraig -x
+ &put
+ scorr
Warning: The network is combinational (run "fraig" or "fraig_sweep").
+ dc2
+ dretime
+ strash
+ dch -f
+ if
+ mfs2
+ lutpack -S 1
+ dress /tmp/yosys-abc-000000/input.blif
Total number of equiv classes                =       2.
Participating nodes from both networks       =       2.
Participating nodes from the first network   =       1. (  50.00 % of nodes)
Participating nodes from the second network  =       1. (  50.00 % of nodes)
Node pairs (any polarity)                    =       1. (  50.00 % of names can be moved)
Node pairs (same polarity)                   =       1. (  50.00 % of names can be moved)
Total runtime =     0.00 sec
+ write_blif /tmp/yosys-abc-000000/output.blif
$

This is quite annoying when the build runs as a part of e.g. the Glasgow software stack, and it can also be really confusing/scary to novice users of Amaranth. Since both Amaranth and ChipFlow now suggest using YoWASP builds of the tools, this needed to be fixed.