interpreter: detect and pass compiler to be used for linker tests

Allow using the links method to test that the C++ driver (e.g. g++) can be used to
link C objects.  One usecase is that the C compiler's libsanitizer might not be
compatible with the one included by the C++ driver.

This is theoretically backwards-incompatible, but it should be treated as a
bugfix in my opinion. There is no way in Meson to compile a .c file with the
C++ driver as part of a build target, therefore there would be no reason to
do something like meson.get_compiler(meson.get_compiler('cpp').links(files('main.c')).

Fixes: #7703

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