More Makefile fixes (test dependencies, test-rewatch)

[cknitt]

• Fixes dependencies for test targets
• Fixes make test-rewatch to find the binary

[pkg-pr-new]

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rescript

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@rescript/darwin-arm64

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@rescript/darwin-x64

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@rescript/linux-arm64

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@rescript/linux-x64

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@rescript/runtime

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@rescript/win32-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/win32-x64@7994

commit: bc23f3e