foreign rules: fix computation of absolute paths

When setting CC, etc, in foreign rules, it is often useful to have it
set as absolute path. This originally was achieved using realpath(1).
This, however, implies that symbolic links are followed as well,
which confuses some compilers if they are not called with correct
argv[0]. Therefore, 4e86f756bddca8db402502be47c0825e1e2aeb0d tries
to replace this by concatenation with $(pwd), which, however, is
only correct for tools brought locally by the toolchain. Hence fix
the test by not evaluating it in the shell at all and rather using
the knowledge about toolchain versus system tools that the rules
have anyway.

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