[linux-x86] Refresh gcc prebuilts for aarch64
This prebuilts uses gcc 4.9 source from google/gcc-4_9 branch.

Change-Id: I18b58d6929a102bf5a47bb764d443e9dedd4a681
diff --git a/aarch64-linux-android/lib/ldscripts/aarch64linux.xd b/aarch64-linux-android/lib/ldscripts/aarch64linux.xd
index 2e7cef5..a2c4256 100644
--- a/aarch64-linux-android/lib/ldscripts/aarch64linux.xd
+++ b/aarch64-linux-android/lib/ldscripts/aarch64linux.xd
@@ -81,7 +81,7 @@
      could instead move the label definition inside the section, but
      the linker would then create the section even if it turns out to
      be empty, which isn't pretty.  */
-  . = ALIGN(32 / 8);
+  . = ALIGN(64 / 8);
   PROVIDE_HIDDEN (__preinit_array_start = .);
   .preinit_array     :
   {