Make improvements for Actually Portable Emacs

- Get SIGWINCH working again on the New Technology
- Correctly handle O_NOFOLLOW in open() on Windows
- Implement synthetic umask() functionality on Windows
- Do a better job managing file execute access on Windows
- Fill in `st_uid` and `st_gid` with username hash on Windows
- Munge UNICODE control pictures into control codes on Windows
- Do a better job ensuring Windows console settings are restored
- Introduce KPRINTF_LOG environment variable to log kprintf to a file

libc/crt/crt.S

@@ -66,6 +66,7 @@ _start:
 	lea	8(%rsp),%rsi			// argv
 	lea	16(%rsp,%rbx,8),%rdx		// envp
 	mov	%rsp,__oldstack(%rip)
+	mov	%rdx,__envp(%rip)
 
 //	setup backtraces
 	xor	%ebp,%ebp
@@ -77,7 +78,8 @@ _start:
 //	make win32 imps noop
 	.weak	ape_idata_iat
 	.weak	ape_idata_iatend
-	ezlea	__win32_oops,ax
+	.weak	__oops_win32
+	ezlea	__oops_win32,ax
 	ezlea	ape_idata_iat,di
 	ezlea	ape_idata_iatend,cx
 	sub	%rdi,%rcx