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/test666

@@ -58,17 +58,17 @@ s/^--------------------------[A-Za-z0-9]*/------------------------------/
 s/boundary=------------------------[A-Za-z0-9]*/boundary=----------------------------/
 </strippart>
 <protocol>
-POST /%TESTNUMBER HTTP/1.1
-Host: %HOSTIP:%HTTPPORT
-Accept: */*
-Content-Length: 17237
-Content-Type: multipart/form-data; boundary=----------------------------
-
-------------------------------
-Content-Disposition: form-data; name="upfile"; filename="myfile.txt"
-Content-Type: text/plain
-Content-Transfer-Encoding: binary
-
+POST /%TESTNUMBER HTTP/1.1%CR
+Host: %HOSTIP:%HTTPPORT%CR
+Accept: */*%CR
+Content-Length: 17237%CR
+Content-Type: multipart/form-data; boundary=----------------------------%CR
+%CR
+------------------------------%CR
+Content-Disposition: form-data; name="upfile"; filename="myfile.txt"%CR
+Content-Type: text/plain%CR
+Content-Transfer-Encoding: binary%CR
+%CR
 ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWX
 ZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVW
 YZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUV
@@ -289,8 +289,8 @@ STUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOP
 RSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNO
 QRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMN
 PQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLM
-OPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUV
---------------------------------
+OPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUV%CR
+--------------------------------%CR
 </protocol>
 </verify>
 </testcase>