For libm, use a macro for aliasing symbols.

Change-Id: Ibd42ebc387c2bf3eba9aa96091770915b4b34184
diff --git a/libm/x86/e_sinh.S b/libm/x86/e_sinh.S
index 9d28a31..d6b04b5 100644
--- a/libm/x86/e_sinh.S
+++ b/libm/x86/e_sinh.S
@@ -324,8 +324,7 @@
 # -- End  sinh
 
 # Start file scope ASM
-.weak sinhl
-.equ sinhl, sinh
+ALIAS_SYMBOL(sinhl, sinh);
 # End file scope ASM
 	.section .rodata, "a"
 	.align 16