Make fixes and improvements

- Introduce __assert_disable global
- Improve strsignal() thread safety
- Make system call tracing thread safe
- Fix SO_RCVTIMEO / SO_SNDTIMEO on Windows
- Refactor DescribeFoo() functions into one place
- Fix fork() on Windows when TLS and MAP_STACK exist
- Round upwards in setsockopt(SO_RCVTIMEO) on Windows
- Disable futexes on OpenBSD which seem extremely broken
- Implement a better kludge for monotonic time on Windows

libc/intrin/findnextfile.c

@@ -37,15 +37,14 @@ textwindows bool32 FindNextFile(int64_t hFindFile,
   bool32 ok;
   ok = __imp_FindNextFileW(hFindFile, out_lpFindFileData);
   if (ok) {
-    NTTRACE(
-        "FindNextFile(%ld, [{"
-        ".cFileName=%#hs, "
-        ".dwFileAttributes=%s, "
-        ".dwFileType=%s"
-        "}]) → %hhhd% m",
-        hFindFile, out_lpFindFileData->cFileName,
-        DescribeNtFileFlagsAndAttributes(out_lpFindFileData->dwFileAttributes),
-        DescribeNtFiletypeFlags(out_lpFindFileData->dwFileType), ok);
+    NTTRACE("FindNextFile(%ld, [{"
+            ".cFileName=%#hs, "
+            ".dwFileAttributes=%s, "
+            ".dwFileType=%s"
+            "}]) → %hhhd% m",
+            hFindFile, out_lpFindFileData->cFileName,
+            DescribeNtFileFlagAttr(out_lpFindFileData->dwFileAttributes),
+            DescribeNtFiletypeFlags(out_lpFindFileData->dwFileType), ok);
   } else {
     if (GetLastError() != kNtErrorNoMoreFiles) __winerr();
     NTTRACE("FindNextFile(%ld) → %hhhd% m", hFindFile, ok);