UPSTREAM: rust: Use grep -Ev rather than relying on GNU grep

While GNU grep supports '\|' when in basic regular expression mode, not
all grep implementations do (notably toybox grep, used to build the
Android kernel, does not). Switching to grep -Ev enables extended
regular expressions which includes support for the '|' operator.

Change-Id: I05958e8a18414f83584df79b9b940d490b1e6f7f
Signed-off-by: Matthew Maurer <mmaurer@google.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20230928201421.2296518-1-mmaurer@google.com


[ Reworded for typo. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
(cherry picked from commit a7135d10)