Make more improvements

This change includes many bug fixes, for the NT polyfills, strings,
memory, boot, and math libraries which were discovered by adding more
tools for recreational programming, such as PC emulation. Lemon has also
been vendored because it works so well at parsing languages.

libc/runtime/executive.S

@@ -20,6 +20,8 @@
 #include "libc/dce.h"
 #include "libc/macros.h"
 #include "libc/notice.inc"
+#include "libc/sysv/consts/prot.h"
+#include "libc/sysv/consts/map.h"
 #include "libc/dce.h"
 .text.startup
 .source	__FILE__
@@ -40,12 +42,15 @@ _executive:
 	mov	%rdx,%r14
 	mov	%rcx,%r15
 	call	_spawn
-	mov	%r12,%rdi
-	mov	%r13,%rsi
-	mov	%r14,%rdx
-	mov	%r15,%rcx
+	call	_getstack
+	mov	%rax,%rdi
 	.weak	main
-	call	main
+	mov	$main,%esi
+	mov	%r12,%rdx
+	mov	%r13,%rcx
+	mov	%r14,%r8
+	mov	%r15,%r9
+	call	_setstack
 	mov	%eax,%edi
 	call	exit
 9:	.endfn	_executive,weak,hidden