Add aarch64-gcc prebuilt.

Change-Id: I028f986d3a62d37c641087a040df1fc41ff1dff2
diff --git a/aarch64-linux-android/lib/ldscripts/aarch64elf.xw b/aarch64-linux-android/lib/ldscripts/aarch64elf.xw
new file mode 100644
index 0000000..61f2e6c
--- /dev/null
+++ b/aarch64-linux-android/lib/ldscripts/aarch64elf.xw
@@ -0,0 +1,220 @@
+/* Script for -z combreloc -z now -z relro: combine and sort reloc sections */
+OUTPUT_FORMAT("elf64-littleaarch64", "elf64-bigaarch64",
+	      "elf64-littleaarch64")
+OUTPUT_ARCH(aarch64)
+ENTRY(_start)
+SECTIONS
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