[Build] Determine the early SwiftSyntax build directory in build-script-impl #61211
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Cross-compilation of the host depends on iteration over all of the host architectures within build-script-impl itself, so the computation of the build directory must occur in build-script-impl. Sink it down there to fix builds for multiple host architectures.
Addresses rdar://100182363, wherein I broke all of the builds involving multiple cross-compiled hosts.