For libm, use a macro for aliasing symbols.

Change-Id: Ibd42ebc387c2bf3eba9aa96091770915b4b34184
diff --git a/libm/x86/s_sin.S b/libm/x86/s_sin.S
index a0578be..1e6cbd4 100644
--- a/libm/x86/s_sin.S
+++ b/libm/x86/s_sin.S
@@ -321,8 +321,7 @@
 # -- End  sin
 
 # Start file scope ASM
-.weak sinl
-.equ sinl, sin
+ALIAS_SYMBOL(sinl, sin);
 # End file scope ASM
 	.section .rodata, "a"
 	.align 16