Remove the ___ hack.

Plain __ for generated syscalls didn't mean it was a hidden symbol, it
just meant "please don't use this". We added ___ to signify that a
hidden symbol should be generated, but then we added the map files
anyway so you now have to explicitly export symbols. Given that, this
convention serves no particular purpose so we may as well just use the
nicer names have everything look the same.

Test: treehugger
Change-Id: If424e17a49c36f4be545f5d283c4561a6ea9c7ea
diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
index b307486..0f3f1dc 100755
--- a/libc/tools/gensyscalls.py
+++ b/libc/tools/gensyscalls.py
@@ -265,8 +265,7 @@
         stub += "\nALIAS_SYMBOL(%s, %s)\n" % (alias, syscall["func"])
 
     # Use hidden visibility on LP64 for any functions beginning with underscores.
-    # Force hidden visibility for any functions which begin with 3 underscores
-    if (pointer_length == 64 and syscall["func"].startswith("__")) or syscall["func"].startswith("___"):
+    if pointer_length == 64 and syscall["func"].startswith("__"):
         stub += '.hidden ' + syscall["func"] + '\n'
 
     return stub