add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/isdn/hardware/mISDN/Makefile
..
..
@@ -15,3 +15,5 @@
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 # chip modules
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 obj-$(CONFIG_MISDN_IPAC) += mISDNipac.o
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 obj-$(CONFIG_MISDN_ISAR) += mISDNisar.o
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+
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+obj-$(CONFIG_MISDN_HDLC) += isdnhdlc.o