remove support for mips64el/loongson3a

We don't have any way to test these, and we do have to
go a little out of our way to maintain these builds.

Change-Id: Ie191ee26753b719f6ee22264d63fbe4252e69bd5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/290840
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index aaa4e62..33dbc35 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2310,8 +2310,7 @@
     }
   }
 
-  if (skia_use_gl && (is_linux || is_mac || is_ios) &&
-      target_cpu != "mips64el" && target_cpu != "loongson3a") {
+  if (skia_use_gl && (is_linux || is_mac || is_ios)) {
     test_app("SkiaSDLExample") {
       sources = [ "example/SkiaSDLExample.cpp" ]
       libs = []