ax_gtest.m4 needs further small improvement

During Kea 2.5.3 rc2 sanity checks it turned out that in case ./configure --with-gtest-source is called with a path with trailing slash /, e.g.

--with-gtest-source=/usr/src/googletest/googletest/

the gtest version could not be correctly detected (#3126 (comment 412356)).

This is a follow up to #3065 (closed)

Trailing slash is a special case and the script needs small patch for that.

Edited Oct 25, 2023 by Piotrek Zadroga

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