Configure: add initial support for 64-bit Android.

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Configurations/10-main.conf

@@ -816,6 +816,18 @@
         perlasm_scheme   => "o32",
     },
 
+    "android64" => {
+        inherit_from     => [ "linux-generic64" ],
+        cflags           => "-mandroid -fPIC --sysroot=\$(CROSS_SYSROOT) -Wa,--noexecstack -Wall",
+        debug_cflags     => "-O0 -g",
+        lflags           => "-pie%-ldl",
+        shared_cflag     => "",
+    },
+    "android64-aarch64" => {
+        inherit_from     => [ "android64", asm("aarch64_asm") ],
+        perlasm_scheme   => "linux64",
+    },
+
 #### *BSD
     "BSD-generic32" => {
         # As for thread_cflag. Idea is to maintain "collective" set of