For libm, use a macro for aliasing symbols.

Change-Id: Ibd42ebc387c2bf3eba9aa96091770915b4b34184
diff --git a/libm/x86/e_log10.S b/libm/x86/e_log10.S
index d34829c..09b2952 100644
--- a/libm/x86/e_log10.S
+++ b/libm/x86/e_log10.S
@@ -242,8 +242,7 @@
 # -- End  log10
 
 # Start file scope ASM
-.weak log10l
-.equ log10l, log10
+ALIAS_SYMBOL(log10l, log10);
 # End file scope ASM
 	.section .rodata, "a"
 	.align 16