slock.1: use standard wording for options

Remove the OPTIONS section and add an EXIT STATUS section.

ref.
https://git.suckless.org/slock/commit/a34d8fb4327bbb1afd92e7527c53fcaad547a495.html

Bump to 4f04554.

Makefile: explicit_bzero.c was copied twice (GNU make gives a warning)

bump version to 1.5

Ref.
https://git.suckless.org/slock/commit/265704d73647e0d4823126bbb7ddde1d415a618d.html
https://git.suckless.org/slock/commit/4f045545a25cc02c64bfc08d27ed2ccecb962292.html

Adding background image patch

Adding dwmlogo patch ref. #5

Adding auto-timeout patch

Adding secret password patch

Adding failure-command patch

Adding color message patch ref. #3

Adding alpha patch

Adding blur pixelated screen patch

Adding keypress_feedback patch

Specifying latest version

Adding xresources patch

Added capscolor, control clear, dpms, mediakeys, message, pam auth, quickcancel patches