[embedded] Make the CMake setup for Embedded Concurrency distinguish ARCH and SUBDIR for builds products #81107
+22
−8
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This is needed to unblock #80984. We previously had two conflicting things in the CMake setup: We need to tell add_swift_target_library_single (1) that it's supposed to put the single slice into e.g. a /armv7-apple-none-macho subdirectory, and (2) that the ARCH is e.g. armv7 (so that it can derive the bitwidth for gyb from that). Previously, both the things are communicated via a single "ARCHITECTURE" argument, so let's split that.