port `tests/ui/linkage-attr/framework` to run-make

this makes it much easier to understand test failures.

before:
```
diff of stderr:

1 error: linking with `LINKER` failed: exit status: 1
2    |
-            ld: Undefined symbols:
4              _CFRunLoopGetTypeID, referenced from:
5            clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

after:
```
=== HAYSTACK ===
error: linking with `cc` failed: exit status: 1
  |
  = note: use `--verbose` to show all linker arguments
  = note: Undefined symbols for architecture arm64:
            "_CFRunLoopGetTypeID", referenced from:
                main::main::hbb553f5dda62d3ea in main.main.d17f5fbe6225cf88-cgu.0.rcgu.o
          ld: symbol(s) not found for architecture arm64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

error: aborting due to 1 previous error

=== NEEDLE ===
_CFRunLoopGetTypeID\.?, referenced from:
thread 'main' panicked at /Users/jyn/git/rust-lang/rust/tests/run-make/linkage-attr-framework/rmake.rs:22:10:
needle was not found in haystack
```

this also fixes a failure related to missing whitespace; we don't actually care about whitespace in this test.

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