rules.mak: Add COMMA constant

Using "," literal in $(call quiet-command, ...) arguments is awkward.
Add this constant to make it at least doable.

Backports commit 2f4e4dc237261c76734d8ae1d8e09d2983d2f1ca from qemu
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Fam Zheng 2018-02-24 16:20:24 -05:00 committed by Lioncash
parent 8df5ad80b1
commit 495c39300c
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@ -1,4 +1,6 @@
COMMA := ,
# Don't use implicit rules or variables
# we have explicit rules for everything
MAKEFLAGS += -rR