Make the 'simd' module build like the rest of the overlays.

jrose-apple · jrose-apple · commit d3291512db02 · 2015-06-17T04:47:55.000Z
At one point we were considering it to be a replacement rather than an
overlay, but that's not where we are today. We can revisit that later.

Necessary for next commit.

Swift SVN r29438
diff --git a/stdlib/public/SDK/simd/CMakeLists.txt b/stdlib/public/SDK/simd/CMakeLists.txt
@@ -1,6 +1,5 @@
-add_swift_library(swiftsimd SHARED IS_STDLIB
+add_swift_library(swiftsimd IS_SDK_OVERLAY
   simd.swift.gyb
 
   SWIFT_COMPILE_FLAGS -Xfrontend -sil-serialize-all
-  SWIFT_MODULE_DEPENDS Darwin
-  INSTALL_IN_COMPONENT stdlib)
+  SWIFT_MODULE_DEPENDS Darwin)
