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/sock/struct/sockaddr.h

@@ -0,0 +1,38 @@
+#ifndef COSMOPOLITAN_LIBC_SOCK_STRUCT_SOCKADDR_H_
+#define COSMOPOLITAN_LIBC_SOCK_STRUCT_SOCKADDR_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+struct sockaddr {     /* Linux+NT ABI */
+  uint16_t sa_family; /* AF_XXX */
+  char sa_data[14];
+};
+
+struct in_addr { /* ARPA ABI */
+  /* e.g. 127|0<<8|0<<16|1<<24 or inet_pton(AF_INET, "127.0.0.1", &s_addr) */
+  uint32_t s_addr;
+};
+
+struct sockaddr_in {   /* Linux+NT ABI */
+  uint16_t sin_family; /* AF_XXX */
+  uint16_t sin_port;   /* htons(XXX) i.e. big endian */
+  struct in_addr sin_addr;
+  uint8_t sin_zero[8];
+};
+
+struct sockaddr_un {
+  uint16_t sun_family; /* AF_UNIX */
+  char sun_path[108];  /* path */
+};
+
+struct sockaddr_storage {
+  union {
+    uint16_t ss_family;
+    intptr_t __ss_align;
+    char __ss_storage[128];
+  };
+};
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_SOCK_STRUCT_SOCKADDR_H_ */