Don't waste time trying to run non-plain file and non-executable files.

Directories, and non-executable files, aren't going to be extcap
executables.

This may not make much of a difference for an installed version of
Wireshark, but it makes a difference if you're running from the build
directory.

Change-Id: Ib9953fa04392dc7a8420ddf28bab9726e6050c12
Reviewed-on: https://code.wireshark.org/review/20752
Reviewed-by: Guy Harris <guy@alum.mit.edu>

0 files changed, 0 insertions, 0 deletions