Fix stdio regression

This change fixes a nasty regression caused by
80b211e314 which deadlocked.

This change also causes MbedTLS to prefer the ChaCha ciphersuite on
older CPUs that don't have AES hardware instructions.

libc/stdio/unlocked/getchar_unlocked.S

@@ -23,7 +23,7 @@
 //	@return	byte in range 0..255, or -1 w/ errno
 //	@see	fgetc_unlocked()
 getchar:
-	lea	stdin(%rip),%rdi
+	mov	stdin(%rip),%rdi
 	mov	%rdi,%r11
 	ezlea	fgetc_unlocked,ax
 	jmp	stdio_unlock

libc/stdio/unlocked/getwchar_unlocked.S

@@ -23,7 +23,7 @@
 //	@return	wide character or -1 on EOF or error
 //	@see	fgetwc_unlocked()
 getwchar:
-	lea	stdin(%rip),%rdi
+	mov	stdin(%rip),%rdi
 	mov	%rdi,%r11
 	ezlea	fgetwc_unlocked,ax
 	jmp	stdio_unlock

libc/stdio/unlocked/putchar_unlocked.S

@@ -24,7 +24,7 @@
 //	@return c (as unsigned char) if written or -1 w/ errno
 //	@see	fputc_unlocked()
 putchar:
-	lea	stdout(%rip),%rsi
+	mov	stdout(%rip),%rsi
 	mov	%rsi,%r11
 	ezlea	fputc_unlocked,ax
 	jmp	stdio_unlock

libc/stdio/unlocked/putwchar_unlocked.S

@@ -24,7 +24,7 @@
 //	@return wc if written or -1 w/ errno
 //	@see	fputwc_unlocked()
 putwchar:
-	lea	stdout(%rip),%rsi
+	mov	stdout(%rip),%rsi
 	mov	%rsi,%r11
 	ezlea	fputwc_unlocked,ax
 	jmp	stdio_unlock