Use diff's --strip-trailing-cr flag where appropriate on Windows

Use diff's --strip-trailing-cr flag where appropriate on Windows

Test result files might be checked out using Unix or Windows style line
endings, depening on git flags, so on Windows we use the
--strip-trailing-cr flag to tell diff to ignore line endings
differences.

The flag is added to the diff invocation for the test_json_parser module
tests and the pg_bsd_indent tests. in pg_regress.c we replace the
current use of the "-w" flag, which ignore all white space differences,
with this one which only ignores line end differences.

Discussion: https://postgr.es/m/20240707052030.r77hbdkid3mwksop@awork3.anarazel.de