eina: fix compilation on OpenBSD/Windows of eina_btlog

We only care whether the process terminated successfully or not.
Non-zero values will be anything but a success, so we don't even care
about the exit code of the program.

This should fix compiling on OpenBSD (where WEXITSTATUS needed
to be defined by including a system header) as well on Windows.

Fixes T3733

src/bin/eina/eina_btlog.c

@@ -277,7 +277,6 @@ _translation_function_detect(const Translation_Desc *desc)
          if (p)
            {
               ret = pclose(p);
-              ret = WEXITSTATUS(ret);
               if (ret == 0)
                 {
                    _translate = d->func;