sync ChangeLog

refactoring: imsg everywhere use imsg to handle ALL kinds of IPC in gmid. This simplifies and shorten the code, and makes everything more uniform too.

handle SIGHUP gracefully i.e. don't print scary messages with LOG_CRIT priority!

split usage string into two lines

fix out-of-bounds access obviously msg[datalen] is an off-by-one

give each server process its own socket for the executor this fixes a bug introduced with the prefork mechanics: every server process shared the same socket, and this would cause a race condition when multiple server processes asked for a script cgi being executed. This gives each server process its own socket to talk to the executor, so the race cannot happen.

include sys/types.s to fix the build on OpenBSD

updated readme

[seccomp] allow sendmsg

sync global variables

move log_init & vars to gmid.c, retain logger_main in log.c this is to let the regression suite compile

checks for compat + don't initialise HAVE_*

fix various error in compat/err.c

make sure -o is passed to ${CC} in suffix rule

clean objects in compat dir