Add epoll and do more release readiness changes

This change also pays off some of the remaining technical debt with
stdio, file descriptors, and memory managemnt polyfills.

libc/nt/ntdll/NtCancelIoFileEx.s

@@ -1,2 +1,12 @@
 .include "o/libc/nt/ntdllimport.inc"
 .ntimp	NtCancelIoFileEx
+
+	.text.windows
+NtCancelIoFileEx:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	__imp_NtCancelIoFileEx(%rip),%rax
+	jmp	__sysv2nt
+	.endfn	NtCancelIoFileEx,globl
+	.previous

libc/nt/ntdll/NtCreateKeyedEvent.s

@@ -1,2 +1,12 @@
 .include "o/libc/nt/ntdllimport.inc"
 .ntimp	NtCreateKeyedEvent
+
+	.text.windows
+NtCreateKeyedEvent:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	__imp_NtCreateKeyedEvent(%rip),%rax
+	jmp	__sysv2nt
+	.endfn	NtCreateKeyedEvent,globl
+	.previous

libc/nt/ntdll/NtReleaseKeyedEvent.s

@@ -1,2 +1,12 @@
 .include "o/libc/nt/ntdllimport.inc"
 .ntimp	NtReleaseKeyedEvent
+
+	.text.windows
+NtReleaseKeyedEvent:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	__imp_NtReleaseKeyedEvent(%rip),%rax
+	jmp	__sysv2nt
+	.endfn	NtReleaseKeyedEvent,globl
+	.previous

libc/nt/ntdll/NtWaitForKeyedEvent.s

@@ -1,2 +1,12 @@
 .include "o/libc/nt/ntdllimport.inc"
 .ntimp	NtWaitForKeyedEvent
+
+	.text.windows
+NtWaitForKeyedEvent:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	__imp_NtWaitForKeyedEvent(%rip),%rax
+	jmp	__sysv2nt
+	.endfn	NtWaitForKeyedEvent,globl
+	.previous

libc/nt/ntdll/RtlNtStatusToDosError.s

@@ -1,2 +1,15 @@
 .include "o/libc/nt/ntdllimport.inc"
 .ntimp	RtlNtStatusToDosError
+
+	.text.windows
+RtlNtStatusToDosError:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_RtlNtStatusToDosError(%rip)
+	leave
+	ret
+	.endfn	RtlNtStatusToDosError,globl
+	.previous