Win32: Refactor target detection

Previously, Visual C++ had only one toolchain for the x86 family, and
the only option was to select the target processor level.

In recent versions, there are multiple toolchains with the same
command name for each host/target platform combination, so it is no
longer possible to select the target with a command-line option. Also,
configure.bat assumes that the toolchain has been configured before it
is executed, so selecting it from this batch file is meaningless.

Therefore, the only possible check is whether the specified target and
compiler match.

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