Elevate Windows production worthiness

- SQLite file locking now works on Windows
- SQLite will now use fdatasync() on non-Apple platforms
- Fix Ctrl-C handler on Windows to not crash with TLS
- Signals now work in multithreaded apps on Windows
- fcntl() will now accurately report EINVAL errors
- fcntl() now has excellent --strace logging
- Token bucket replenish now go 100x faster
- *NSYNC cancellations now work on Windows
- Support closefrom() on NetBSD

libc/calls/struct/flock.internal.h

@@ -0,0 +1,13 @@
+#ifndef COSMOPOLITAN_LIBC_CALLS_STRUCT_FLOCK_INTERNAL_H_
+#define COSMOPOLITAN_LIBC_CALLS_STRUCT_FLOCK_INTERNAL_H_
+#include "libc/calls/struct/flock.h"
+#include "libc/mem/alloca.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+const char *DescribeFlock(char[300], int, const struct flock *);
+#define DescribeFlock(c, l) DescribeFlock(alloca(300), c, l)
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_FLOCK_INTERNAL_H_ */