Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
index 30590cd..6388ee1 100755
--- a/libc/tools/gensyscalls.py
+++ b/libc/tools/gensyscalls.py
@@ -48,8 +48,8 @@
 
 
 function_alias = """
-    .globl _C_LABEL(%(alias)s)
-    .equ _C_LABEL(%(alias)s), _C_LABEL(%(func)s)
+    .globl %(alias)s
+    .equ %(alias)s, %(func)s
 """