Restart CI for New Technology and UBSAN hunting

Continuous Integration (via runit and runitd) is now re-enabled on win7
and win10. The `make test` command, which runs the tests on all systems
is now the fastest and most stable it's been since the project started.

UBSAN is now enabled in MODE=dbg in addition to ASAN. Many instances of
undefined behavior have been removed. Mostly things like passing a NULL
argument to memcpy(), which works fine with Cosmopolitan Libc, but that
doesn't prevents the compiler from being unhappy. There was an issue w/
GNU make where static analysis claims a sprintf() call can overflow. We
also now have nicer looking crash reports on Windows since uname should
now be supported and msys64 addr2line works reliably.

Makefile

@@ -60,7 +60,7 @@
 #   build/config.mk
 
 SHELL   = /bin/sh
-HOSTS  ?= freebsd openbsd netbsd rhel7 rhel5 xnu #win7 win10
+HOSTS  ?= freebsd openbsd netbsd rhel7 rhel5 xnu win7 win10
 SANITY := $(shell build/sanitycheck $$PPID)
 
 .SUFFIXES:
@@ -69,7 +69,10 @@ SANITY := $(shell build/sanitycheck $$PPID)
 .PHONY: all o bins check test depend tags
 
 all:	o
-o:	o/$(MODE)/ape		\
+o:	o/$(MODE)
+
+o/$(MODE):			\
+	o/$(MODE)/ape		\
 	o/$(MODE)/dsp		\
 	o/$(MODE)/net		\
 	o/$(MODE)/libc		\