portable: propagate AM_CFLAGS/AM_CPPFLAGS Compiling with warnings and certain compiler flags is important for security and bug-free code. Set a bunch of warnings via AM_CFLAGS in a common Makefile, and let those values propagate to all other Makefiles. While here, also fix the version string to remove quotes.

libexec: honour libeexec path for helpers libexec is a common path which is understood by autotools, and should be honoured. Patch from Christian "naddy" Weisgerber

portable: add FreeBSD support This adds the capability to compile got-portable on FreeBSD.

manpages: install .5 to correct location When installing man pages, split out .1 and .5 as they install to different paths.

dist: rework files for distcheck Rather than having a toplevel EXTRA_DIST target in the toplevel Makefile.am file, move the relevant files to their own Makefile.am locations.

automake: Fix path to libexec directory The got_lib_privsep.h header expects the path to the libexec directory to be called GOT_LIBEXECDIR. At the moment it always falls back to using /usr/libexec. Fix what looks to be a typo.

portable: initial Linux compilation This commit modifies the GoT main branch to be able to compile it under linux.