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/tinymath/fmod.S

@@ -19,13 +19,13 @@
 #include "libc/macros.h"
 .source	__FILE__
 
-/	fmod [sic] does (𝑥 rem 𝑦) w/ round()-style rounding.
-/
-/	@param	𝑥 is double passed in lower half of %xmm0
-/	@param	𝑦 is double passed in lower half of %xmm1
-/	@return	remainder ∈ (-|𝑦|,|𝑦|) in %xmm0
-/	@define	𝑥-trunc(𝑥/𝑦)*𝑦
-/	@see	emod()
+//	fmod [sic] does (𝑥 rem 𝑦) w/ round()-style rounding.
+//
+//	@param	𝑥 is double passed in lower half of %xmm0
+//	@param	𝑦 is double passed in lower half of %xmm1
+//	@return	remainder ∈ (-|𝑦|,|𝑦|) in %xmm0
+//	@define	𝑥-trunc(𝑥/𝑦)*𝑦
+//	@see	emod()
 fmod:	ezlea	fmodl,ax
 	jmp	_d2ld2
 	.endfn	fmod,globl