For libm, use a macro for aliasing symbols.

Change-Id: Ibd42ebc387c2bf3eba9aa96091770915b4b34184
diff --git a/libm/x86/s_log1p.S b/libm/x86/s_log1p.S
index 76fb826..7a6d845 100644
--- a/libm/x86/s_log1p.S
+++ b/libm/x86/s_log1p.S
@@ -266,8 +266,7 @@
 # -- End  log1p
 
 # Start file scope ASM
-.weak log1pl
-.equ log1pl, log1p
+ALIAS_SYMBOL(log1pl, log1p);
 # End file scope ASM
 	.section .rodata, "a"
 	.align 16