Fix Soong x86 builds

Change-Id: Ida3f3584f832d61caf7200557ea57be799eaf38e
diff --git a/libc/Android.bp b/libc/Android.bp
index 8df77ce..c7f18b9 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -153,7 +153,7 @@
             srcs: ["arch-arm64/bionic/__set_tls.c"],
         },
         x86: {
-            srcs: ["arch-arm64/bionic/__set_tls.c"],
+            srcs: ["arch-x86/bionic/__set_tls.c"],
         },
         x86_64: {
             srcs: ["arch-x86_64/bionic/__set_tls.c"],