Only build for x86 Android architectures.

Change-Id: I06da8a8e48f202d6625c6d6eb8569be3867da13c
Reviewed-on: https://swiftshader-review.googlesource.com/4341
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/4352
diff --git a/Android.mk b/Android.mk
index 85a6873..575c18f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -20,6 +20,8 @@
 SWIFTSHADER_OPTIM := release
 endif
 
+ifneq ($(filter x86, $(TARGET_ARCH)),)
 ifneq ($(filter gce_x86 gce calypso, $(TARGET_DEVICE))$(filter sdk_google_%, $(TARGET_PRODUCT)),)
 include $(call all-makefiles-under,$(LOCAL_PATH))
 endif
+endif
\ No newline at end of file