Remove sun musl fdlibm math library

The libm code from musl wasn't being used since most of these functions
are implemented using x87 which goes faster than a library intended for
risc machines.

libc/tinymath/sincosl.S

@@ -26,7 +26,7 @@
 /	@param	%rdi is long double *out_sin
 /	@param	%rsi is long double *out_cos
 /	@domain	-(3π/8) < 𝑥 < 3π/8 for best accuracy
-tinymath_sincosl:
+sincosl:
 	push	%rbp
 	mov	%rsp,%rbp
 	.profilable
@@ -48,5 +48,4 @@ tinymath_sincosl:
 	jnz	2b
 	fstp	%st(1)
 	jmp	0b
-	.endfn	tinymath_sincosl,globl
-	.alias	tinymath_sincosl,sincosl
+	.endfn	sincosl,globl