For libm, use a macro for aliasing symbols.

Change-Id: Ibd42ebc387c2bf3eba9aa96091770915b4b34184
diff --git a/libm/x86/e_hypot.S b/libm/x86/e_hypot.S
index aa6ab64..6a143e5 100644
--- a/libm/x86/e_hypot.S
+++ b/libm/x86/e_hypot.S
@@ -199,8 +199,7 @@
 # -- End  hypot
 
 # Start file scope ASM
-.weak hypotl
-.equ hypotl, hypot
+ALIAS_SYMBOL(hypotl, hypot);
 # End file scope ASM
 	.section .rodata, "a"
 	.align 16