add arg.h and util.h to Makefile
clear passwords with explicit_bzero
Make sure to explicitly clear memory that is used for password input. memset
is often optimized out by the compiler.
Brought to attention by the OpenBSD community, see:
Thread subject: x11/slock: clear passwords with explicit_bzero
- explicit_bzero.c import from libressl-portable.
- Makefile: add COMPATSRC for compatibility src.
- config.mk: add separate *BSD section in config.mk to simply uncomment it on
applied sin's patch and prepared new release
updating copyright stuff in slock as well
fixed a potential buffer overflow bug on the stack (thanks to Ghassan Misherg)