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d/rules.real: Export CROSS_COMPILE_COMPAT, CROSS32_COMPILE variables

Ben Hutchings requested to merge benh/linux:arm64-compat-vdso into debian/latest

On arm64 the config symbol COMPAT_VDSO has a dependency on $(CROSS_COMPILE_COMPAT) being non-empty. This requires that CROSS_COMPILE_COMPAT is an environment variable.

Since 6.4~rc7-1~exp1 we set CROSS_COMPILE_COMPAT in .kernelvariables. Unlike ARCH and CROSS_COMPILE, this is not exported by the upstream Makefile, so the dependencies of COMPAT_VDSO were not satisified.

In earlier versions debian/rules.gen passed CROSS_COMPILE_COMPAT on the make command line for debian/rules.real, which automatically made it an environment variable too (TIL) despite the lack of an explicit export.

Change the generation of .kernelvariables to export CROSS_COMPILE_COMPAT. While we're here, do the same for CROSS32_COMPILE so that if parisc or powerpc start using it in config that will also work.

This re-enables the compat vDSO on arm64.

Fixes: 71d03aa1 ("linux-image: Define CROSS_COMPILE and ...")

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