make JSCRuntime SystemJSCAPITestFactory build only on apple platforms

Summary: Changelog: [Internal]

Reviewed By: jbower-fb

Differential Revision: D19874225

fbshipit-source-id: ca730391ea4734bdc98f91d8307bd9d622f27772

ReactCommon/jsi/BUCK

@@ -1,5 +1,6 @@
 # BUILD FILE SYNTAX: SKYLARK
 
+load("@fbsource//tools/build_defs:default_platform_defs.bzl", "APPLE", "IOS", "MACOSX")
 load("//tools/build_defs/oss:rn_defs.bzl", "react_native_xplat_dep", "rn_xplat_cxx_library")
 
 rn_xplat_cxx_library(
@@ -70,6 +71,7 @@ rn_xplat_cxx_library(
     exported_headers = [
         "JSCRuntime.h",
     ],
+    apple_sdks = (IOS, MACOSX),
     cxx_exported_platform_linker_flags = [
         (
             "macosx-x86_64",
@@ -104,6 +106,7 @@ rn_xplat_cxx_library(
     fbobjc_labels = ["supermodule:ios/default/private.react_native.infra"],
     # TODO (T55502220): Remove when iOS 9.0 deprecation is complete everywhere.
     fbobjc_target_sdk_version = "9.0",
+    platforms = APPLE,
     visibility = ["PUBLIC"],
     xplat_mangled_args = {
         "soname": "libjscjsi.$(ext)",