Make gensyscalls.py use the ALIAS_SYMBOL macro.

Change-Id: Ib94c0abb6fc85126ecc5ed3f1962b2b8b90b9952
diff --git a/libc/arch-x86/syscalls/_exit.S b/libc/arch-x86/syscalls/_exit.S
index 8528ee4..9945b35 100644
--- a/libc/arch-x86/syscalls/_exit.S
+++ b/libc/arch-x86/syscalls/_exit.S
@@ -20,5 +20,4 @@
     ret
 END(_exit)
 
-    .globl _Exit
-    .equ _Exit, _exit
+ALIAS_SYMBOL(_Exit, _exit)
diff --git a/libc/arch-x86/syscalls/fstat64.S b/libc/arch-x86/syscalls/fstat64.S
index fc16233..ba385a4 100644
--- a/libc/arch-x86/syscalls/fstat64.S
+++ b/libc/arch-x86/syscalls/fstat64.S
@@ -25,5 +25,4 @@
     ret
 END(fstat64)
 
-    .globl fstat
-    .equ fstat, fstat64
+ALIAS_SYMBOL(fstat, fstat64)
diff --git a/libc/arch-x86/syscalls/fstatat64.S b/libc/arch-x86/syscalls/fstatat64.S
index a3697e6..90e87b6 100644
--- a/libc/arch-x86/syscalls/fstatat64.S
+++ b/libc/arch-x86/syscalls/fstatat64.S
@@ -35,5 +35,4 @@
     ret
 END(fstatat64)
 
-    .globl fstatat
-    .equ fstatat, fstatat64
+ALIAS_SYMBOL(fstatat, fstatat64)