tests: replace remaining CR bytes with the new macro %CR

There is no more mixed-newline file in the repository after this patch.
Except for`.bat` and `.sln` files (4 in total), all files use LF
newlines.

Also:
- `spacecheck.pl`: drop mixed-EOL exception for test data.
- runtests: add option `-w` to check if test data has stray CR bytes in
  them.
- build: enable the option above in test targets, except the CI-specific
  one where `spacecheck.pl` does this job already.
- tested OK (with expected failures) in CI with stray CRs added.
- cmake: enable option `-a` for the `tests` target. To continue testing
  after a failed test.

Follow-up to 63e9721b63 #19313
Follow-up to 6cf3d7b1b1 #19318
Follow-up to 4d2a05d3fe #19284

Closes #19347

tests/data/test668

@@ -65,38 +65,38 @@ s/boundary=------------------------[A-Za-z0-9]*/boundary=-----------------------
 # boundary string and since 5 of them are in the body contents, we see
 # (5*12) == 60 bytes less
 <protocol>
-POST /%TESTNUMBER HTTP/1.1
-Host: %HOSTIP:%HTTPPORT
-Accept: */*
-Transfer-Encoding: chunked
-Content-Type: multipart/form-data; boundary=----------------------------
-Expect: 100-continue
-
-cd
-------------------------------
-Content-Disposition: form-data; name="field1"
-
-dummy
-------------------------------
-Content-Disposition: form-data; name="field2"
-
-
-5
-dummy
-97
-
-------------------------------
-Content-Disposition: form-data; name="field3"; filename="file%TESTNUMBER.txt"
-Content-Type: text/plain
-
-
-4f
+POST /%TESTNUMBER HTTP/1.1%CR
+Host: %HOSTIP:%HTTPPORT%CR
+Accept: */*%CR
+Transfer-Encoding: chunked%CR
+Content-Type: multipart/form-data; boundary=----------------------------%CR
+Expect: 100-continue%CR
+%CR
+cd%CR
+------------------------------%CR
+Content-Disposition: form-data; name="field1"%CR
+%CR
+dummy%CR
+------------------------------%CR
+Content-Disposition: form-data; name="field2"%CR
+%CR
+%CR
+5%CR
+dummy%CR
+97%CR
+%CR
+------------------------------%CR
+Content-Disposition: form-data; name="field3"; filename="file%TESTNUMBER.txt"%CR
+Content-Type: text/plain%CR
+%CR
+%CR
+4f%CR
 This is data from a file
-
---------------------------------
-
-0
-
+%CR
+--------------------------------%CR
+%CR
+0%CR
+%CR
 </protocol>
 </verify>
 </testcase>