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.

libc/str/crc32c.c

@@ -35,6 +35,9 @@ uint32_t crc32c(uint32_t init, const void *data, size_t size) {
   pe = p + size;
   h = init ^ 0xffffffff;
   if (X86_HAVE(SSE4_2)) {
+    while (p < pe && ((intptr_t)p & 7)) {
+      h = h >> 8 ^ kCrc32cTab[(h & 0xff) ^ *p++];
+    }
     for (; p + 8 <= pe; p += 8) {
       asm("crc32q\t%1,%0" : "+r"(h) : "rm"(*(const uint64_t *)p));
     }