Fix x86-64 Android build.

runtime/bin/directory_android.cc

Index: runtime/bin/directory_android.cc
diff --git a/runtime/bin/directory_android.cc b/runtime/bin/directory_android.cc
index 5d2464902b28456861fb878f739cf4b2f5c7f8d3..40bcde3f64f431c80f2b4bc12f79243371c7ee00 100644
--- a/runtime/bin/directory_android.cc
+++ b/runtime/bin/directory_android.cc
@@ -373,19 +373,6 @@ bool Directory::Create(const char* dir_name) {
 }
 
 
-// Android doesn't currently provide mkdtemp.  Once Android provied mkdtemp,

[zra, 2016/03/03 18:54:04]

This comment appears to have been inaccurate. mkdtemp is definitely there going
back quite a bit.

-// remove this function in favor of calling mkdtemp directly.
-static char* MakeTempDirectory(char* path_template) {
-  if (mktemp(path_template) == NULL) {
-    return NULL;
-  }
-  if (mkdir(path_template, 0700) != 0) {
-    return NULL;
-  }
-  return path_template;
-}
-
-
 char* Directory::SystemTemp() {
   // Android does not have a /tmp directory. A partial substitute,
   // suitable for bring-up work and tests, is to create a tmp
@@ -416,7 +403,7 @@ char* Directory::CreateTemp(const char* prefix) {
   }
   char* result;
   do {
-    result = MakeTempDirectory(path.AsString());
+    result = mkdtemp(path.AsString());
   } while (result == NULL && errno == EINTR);
   if (result == NULL) {
     return NULL;