Add support for MIPS64.

Change-Id: I78e27bf942b4a825543e76be25546b6458bad8b6

build/make/rtcd.pl

diff --git a/build/make/rtcd.pl b/build/make/rtcd.pl
index 28ef69c..5b0cefa 100755
--- a/build/make/rtcd.pl
+++ b/build/make/rtcd.pl
@@ -365,13 +365,13 @@
   @REQUIRES = filter(keys %required ? keys %required : qw/mmx sse sse2/);
   &require(@REQUIRES);
   x86;
-} elsif ($opts{arch} eq 'mips32') {
-  @ALL_ARCHS = filter(qw/mips32/);
+} elsif ($opts{arch} eq 'mips32' || $opts{arch} eq 'mips64') {
+  @ALL_ARCHS = filter("$opts{arch}");
   open CONFIG_FILE, $opts{config} or
     die "Error opening config file '$opts{config}': $!\n";
   while (<CONFIG_FILE>) {
     if (/HAVE_DSPR2=yes/) {
-      @ALL_ARCHS = filter(qw/mips32 dspr2/);
+      @ALL_ARCHS = filter("$opts{arch}", qw/dspr2/);
       last;
     }
   }