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

libc/libc.x86_64.map

@@ -241,7 +241,6 @@ LIBC {
     dup3;
     duplocale;
     endmntent;
-    endpwent; # arm arm64 x86 x86_64 mips mips64 nobrillo
     endservent;
     endutent;
     environ;
@@ -1182,7 +1181,5 @@ LIBC_N {
 
 LIBC_PRIVATE {
   global:
-    dlmalloc_inspect_all; # arm arm64 x86 x86_64 mips mips64 nobrillo
-    dlmalloc_trim; # arm arm64 x86 x86_64 mips mips64 nobrillo
     gMallocLeakZygoteChild;
 } LIBC_N;