Get codebase completely working with LLVM

You can now build Cosmopolitan with Clang:

    make -j8 MODE=llvm
    o/llvm/examples/hello.com

The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.

libc/runtime/cosmo.S

@@ -24,13 +24,13 @@
 #include "libc/dce.h"
 .text.startup
 
-/	Cosmopolitan runtime.
-/
-/	@param	edi is argc
-/	@param	rsi is argv
-/	@param	rdx is environ
-/	@param	rcx is auxv
-/	@noreturn
+//	Cosmopolitan runtime.
+//
+//	@param	edi is argc
+//	@param	rsi is argv
+//	@param	rdx is environ
+//	@param	rcx is auxv
+//	@noreturn
 cosmo:	push	%rbp
 	mov	%rsp,%rbp
 	mov	%edi,%r12d
@@ -60,10 +60,6 @@ cosmo:	push	%rbp
 	add	$8,%rax
 	jmp	1b
 2:	nop
-#if !IsTrustworthy()
-	mov	$PROT_READ,%edi
-	call	_piro
-#endif
 	call	.Largs
 	.weak	main
 	call	main