Fix allowing Windows newlines in sh files.

llvm.sh must always use Linux newlines due to the #! line as a \r
character is considered part of the invoked program. This change fixes
that by simply forcing Unix newlines on all .sh files, like we do with
other file formats like C++ & Dart already.

Fixes: b/330293090
Change-Id: Iaf044da487261908f96c76d5c62385a033106a0b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/358480
Commit-Queue: Jonas Termansen <[email protected]>
Commit-Queue: William Hesse <[email protected]>
Auto-Submit: Jonas Termansen <[email protected]>
Reviewed-by: William Hesse <[email protected]>

Author: sortie

.gitattributes

@@ -4,6 +4,7 @@
 *.cpp text eol=lf
 *.h text eol=lf
 *.dart text eol=lf
+*.sh text eol=lf
 
 # Explicitly declare text files we want to be normalized.
 *.gyp text