libarchive: Disable more whitespace checks in third-party code

Utilities/cmlibarchive/.gitattributes

@@ -1,2 +1 @@
-*.h              whitespace=indent-with-non-tab,-blank-at-eol
-*.c              whitespace=indent-with-non-tab,-blank-at-eol
+* whitespace=-indent-with-non-tab,-tab-in-indent,-blank-at-eol,-blank-at-eof