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.

Signed-off-by: Matthew Maurer <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Reviewed-by: Trevor Gross <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Tested-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Reworded for typo. ]
Signed-off-by: Miguel Ojeda <[email protected]>

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