1.3 stable

Minor fixes.

Attached .so file compiled with gcc 10.2.0 as gcc -pedantic -D "DEBUG=0" -o limited_autoload.so limited_autoload.c $(pkg-config --cflags mpv) -shared -fPIC -Wall -O2 -Wvla on Arch Linux.

1.0: Add filename extension filter + allow no recursion

* Allow the user to limit recursion to depth = 1 with "recurse" option.
* Filter out filename extensions in the "exclude" argument.