Maya Rashish 417bd1e716 m4: Improve portability for non-bash shells
= and == are both operators to test for string equality in bash,
but only = is required by POSIX.

Signed-off-by: Maya Rashish <coypu@sdf.org>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
2019-10-22 11:39:38 +02:00
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