Commit Briefs
fix getprogname shim
HAVE_PROGRAM_INVOCATION_SHORT_NAME is always defined; look at wether it's zero or not.
improve compat/getprogname on GNU libc
but why'd they called it program_invocation_short_name? They couldn't find a longer name?
fixing compat compilation
include headers if needed and include config.h
add a configure script and some compat
tested on openbsd, alpine and void