kbuild: drop -Wundef from HOSTCFLAGS for now
-Wundef caused warnings in the bison generated code in kconfig. Updating to a newer bison (1.875d) did not fix it. The alternatives was to correct the autogenerated code or drop -Wundef. For now -Wundef is dropped from HOSTCFLAGS. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> ---
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@ -203,7 +203,7 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
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HOSTCC = gcc
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HOSTCXX = g++
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HOSTCFLAGS = -Wall -Wundef -Wstrict-prototypes -O2 -fomit-frame-pointer
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HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
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HOSTCXXFLAGS = -O2
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# Decide whether to build built-in, modular, or both.
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