[Test][Embedded] Make dependencies print compatible with lit shell

[ramonasuncion]

Partially addresses #84407

Reference

• Option or command for finding whether a file is empty

[ramonasuncion]

Yeah, this is best I could do. I don't know why I thought diff -u would have been better. To even get it to work, you have to remove from ...macos.txt (what I'm using to test this on):

___divti3
___modti3
_memset

I'll have to recheck what I did for other test because some did work.

[ramonasuncion]

@swift-ci please smoke test

[ramonasuncion]

[2025-12-06T09:39:24.209Z] comm: file 1 is not in sorted order
[2025-12-06T09:39:24.209Z] comm: input is not in sorted order

It doesn't even want to be sorted - more errors. I'll relook in a bit. 🫠

# executed command: test '!' -s /home/ramon/swift-project/build/Ninja-RelWithDebInfoAssert/swift-linux-x86_64/test-linux-x86_64/embedded/Output/dependencies-print.swift.tmp/extra.txt
# note: command had no output on stdout or stderr
# error: command failed with exit status: 1