Remove remaining ndk_cruft from LP64 platforms

This change removes endpwent, dlmalloc_inspect_all, dlmalloc_trim
from lp64 libc.so. It also removed necessety of having brillo
version scripts for lp64 platforms.

Bug: http://b/26164862
Change-Id: I4e9b38907bb1dc410f0eb6d2f5d5944fe713da51
diff --git a/libc/libc.arm.map b/libc/libc.arm.map
index d6f5407..1a666f4 100644
--- a/libc/libc.arm.map
+++ b/libc/libc.arm.map
@@ -383,7 +383,7 @@
     dup3;
     duplocale;
     endmntent;
-    endpwent; # arm arm64 x86 x86_64 mips mips64 nobrillo
+    endpwent; # arm x86 mips nobrillo
     endservent;
     endutent;
     environ;
@@ -1447,8 +1447,8 @@
     _Unwind_VRS_Set; # arm
     atexit; # arm
     dlmalloc; # arm x86 mips nobrillo
-    dlmalloc_inspect_all; # arm arm64 x86 x86_64 mips mips64 nobrillo
-    dlmalloc_trim; # arm arm64 x86 x86_64 mips mips64 nobrillo
+    dlmalloc_inspect_all; # arm x86 mips nobrillo
+    dlmalloc_trim; # arm x86 mips nobrillo
     dlmalloc_usable_size; # arm x86 mips nobrillo
     gMallocLeakZygoteChild;
     SHA1Final; # arm x86 mips