lib/makeversion: Use 7-digit hash like git

lib/makeversion: Make version a proper text file (ending newline)

lib/make{date,version}: Make version use last commit if ahead of tag

lib/makedate: Remove extra code; set LC_ALL=C for consistent dates

Add got(1) support

Fix drawing flags in list vs in edit box

Signed-off-by: Страхиња Радић <contact@strahinja.org>

Fix a few potential bugs thanks to LLVM's scan-build

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.1.in: Convert tables to .Bl -column

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.1.in: Syntax fixes; add EXIT STATUS; poe.c: Usage syntax

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.c: Add missing part of copyright; poe.1.in: Add missing .Nm

Signed-off-by: Страхиња Радић <contact@strahinja.org>

Optimize flags formatting; poe.1.in: Remove .sp 1 requests

Signed-off-by: Страхиња Радић <contact@strahinja.org>

config.mk: Add CFLAGS

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.1.in: Use key names instead of glyphs

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.c: Reformat usage text

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.1.in: Add spacing after the flags table

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.1.in: Convert subsection titles to lowercase

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.1.in: Convert to mdoc(7); poe.c(main): Also print copyright with -V

Signed-off-by: Страхиња Радић <contact@strahinja.org>

config.mk: Add DESTDIR macro

Signed-off-by: Страхиња Радић <contact@strahinja.org>

poe.c: sled -> PROGRAMNAME

Signed-off-by: Страхиња Радић <contact@strahinja.org>

config.mk: Split CFLAGS -> CFLAGS+CPPFLAGS; -g -> -Os; comment out CC by
default; INSTALL: Revise OpenBSD section, remove gzip optional requirement

Signed-off-by: Страхиња Радић <contact@strahinja.org>