[gitattributes] Mark some llvm-rc inputs as requiring LF newlines (#113222)

These text files get embedded verbatim in
llvm/test/tools/llvm-rc/tag-html.test, so their newlines form needs to
match the expected form exactly.

This reverts commit 2fdf49db75, as that
change no longer should be necessary. (At the time, buildbots had
checkouts with all files having CRLF, and those don't get updated even
if the toplevel .gitattributes were reverted in
e669bbbb72. Now those buildbots have
gotten fresh checkouts with all files having the right line endings.)

llvm/.gitattributes

@@ -25,6 +25,7 @@ test/tools/llvm-mca/X86/directives-handle-crlf.s text eol=crlf
 
 # These files must have LF line endings because the test requires exact matching
 test/Object/Inputs/*.tbd eol=lf
+test/tools/llvm-rc/Inputs/webpage*.html text eol=lf
 test/tools/llvm-strings/radix.test text eol=lf
 test/tools/llvm-tapi-diff/Inputs/*.tbd text eol=lf
 test/tools/split-file/basic.test text eol=lf

llvm/test/tools/llvm-rc/tag-html.test

@@ -1,7 +1,5 @@
 ; RUN: rm -rf %t && mkdir %t && cd %t
-; Remove `\r` in case Git on Windows decided to checkout with Windows newlines.
-; RUN: tr -d '\r' <%p/Inputs/webpage1.html > ./webpage1.html
-; RUN: tr -d '\r' <%p/Inputs/webpage2.html > ./webpage2.html
+; RUN: cp %p/Inputs/webpage*.html .
 ; RUN: llvm-rc -no-preprocess /FO %t/tag-html.res -- %p/Inputs/tag-html.rc
 ; RUN: llvm-readobj %t/tag-html.res | FileCheck %s --check-prefix HTML