Update OS support list in INSTALL
Allow for generic builds when we do not explicitly support the OS
Fixup windows build target for mingw
Make ax_platform consistent in naming of targets
Start MinGW support
Fix Linux builds
Remove unused Makefile
Add basic GNU/Hurd build support
fork clock-linux.c for GNU/Hurd
On GNU/Hurd now use a platform specific interface
Add GNU/Hurd configure extras for -ltr
add configure magic for GNU/kFreeBSD
Add note about GNU/kFreeBSD
Add TARGET_OS_GNUKFREEBSD
For now we TARGET_OS_FREEBSD if we would also target TARGET_OS_GNUKFREEBSD