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depends: Use `CC_FOR_BUILD` for `config.guess `

Placeholder Hennadii Stepanov requested to merge github/fork/hebasto/240425-guess-cc into master

On the master branch @ 3c88eac2, consider the following commands in the depends subdirectory:

$ make print-build HOST=i686-pc-linux-gnu CC="clang -m32"
build=x86_64-pc-linux-gnu
$ make print-host HOST=i686-pc-linux-gnu CC="clang -m32"
host=i686-pc-linux-gnu

The printed variable values are expected.

However, switching the CC variable context from Makefile to the shell environment breaks expectations:

$ CC="clang -m32" make print-build HOST=i686-pc-linux-gnu
build=i686-pc-linux-gnu
$ CC="clang -m32" make print-host HOST=i686-pc-linux-gnu
host=i686-pc-linux-gnu

This PR fixes this issue.

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