t4051: mark supporting files as requiring LF-only line endings

The test t4051-diff-function-context.sh passes on Linux when core.autocrlf=true even without marking its support files as LF-only, but they fail when core.autocrlf=true in Git for Windows' SDK. The reason is that `grep ... >file.c.new` will keep CR/LF line endings on Linux (obviously treating CRs as if they were regular characters), but will be converted to LF-only line endings with MSYS2's grep that is used in Git for Windows. As we do not want to validate the way the available `grep` works, let's just mark the input as LF-only and move on. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>