Perform fine-tuning of socketpair and pipe

- removed unneeded share parameter from pipe on nt
- socktpair(type | SOCK_CLOEXEC) is now polyfilled
- use textwindows for linker micro-optimization
- apologies for auto clang-format diff noise :(
- improve socketpair docstring

See #122

libc/calls/internal.h

@@ -67,7 +67,6 @@ hidden extern int __vforked;
 hidden extern unsigned __sighandrvas[NSIG];
 hidden extern struct Fds g_fds;
 hidden extern const struct NtSecurityAttributes kNtIsInheritable;
-hidden extern const char kPipeNamePrefix[];
 
 int __reservefd(void) hidden;
 void __releasefd(int) hidden;
@@ -292,7 +291,6 @@ unsigned __wincrash_nt(struct NtExceptionPointers *);
 ssize_t sys_readv_nt(struct Fd *, const struct iovec *, int) hidden;
 ssize_t sys_writev_nt(struct Fd *, const struct iovec *, int) hidden;
 char16_t *CreatePipeName(char16_t *) hidden;
-size_t UintToChar16Array(char16_t *, uint64_t) hidden;
 
 /*───────────────────────────────────────────────────────────────────────────│─╗
 │ cosmopolitan § syscalls » metal                                          ─╬─│┼