add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/fscache/Makefile
..
..
@@ -3,6 +3,8 @@
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 # Makefile for general filesystem caching code
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 #
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+ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=ANDROID_GKI_VFS_EXPORT_ONLY
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+
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 fscache-y := \
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 	cache.o \
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 	cookie.o \