Some toolchains ship only bits/*.h without the -64.h suffix,
causing the recipe to fail. Add a fallback to use *.h if
*-64.h is not found, and warn if neither exists.
Signed-off-by: Nylon Chen <nylon.chen@sifive.com>
Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
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