kbuild: rename extmod-prefix to extmod_prefix
This seems to be useful in sub-make as well. As a preparation of exporting it, rename extmod-prefix to extmod_prefix because exported variables cannot contain hyphens. Signed-off-by:Masahiro Yamada <masahiroy@kernel.org> Reviewed-by:
Nick Desaulniers <ndesaulniers@google.com>
parent
1a998be6
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