Add systemJSCWrapper.cpp to React-tvOS target

Summary:
**Motivation**: Fix Apple TV build breakage

**Test plan**: This fixes Travis test that builds tvOS targets.
Closes #12869

Differential Revision: D4692883

fbshipit-source-id: 3babfe4ab6d80143e15410bff7cae41ada3bf09f

React/React.xcodeproj/project.pbxproj

@@ -154,6 +154,7 @@
 		2D3B5EF01D9B09E300451313 /* RCTWrapperViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 13B080241A694A8400A75B9A /* RCTWrapperViewController.m */; };
 		2D3B5EF11D9B09E700451313 /* UIView+React.m in Sources */ = {isa = PBXBuildFile; fileRef = 13E067541A70F44B002CDEE1 /* UIView+React.m */; };
 		2D74EAFA1DAE9590003B751B /* RCTMultipartDataTask.m in Sources */ = {isa = PBXBuildFile; fileRef = 006FC4131D9B20820057AAAD /* RCTMultipartDataTask.m */; };
+		2D7FEB891E734B5700D3238C /* systemJSCWrapper.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 65F3E41D1E73031C009375BD /* systemJSCWrapper.cpp */; };
 		2D8C2E331DA40441000EE098 /* RCTMultipartStreamReader.m in Sources */ = {isa = PBXBuildFile; fileRef = 001BFCCF1D8381DE008E587E /* RCTMultipartStreamReader.m */; };
 		2D9F8B9B1DE398DB00A16144 /* RCTPlatform.m in Sources */ = {isa = PBXBuildFile; fileRef = 3D7749431DC1065C007EC8D8 /* RCTPlatform.m */; };
 		2DD0EFE11DA84F2800B0C975 /* RCTStatusBarManager.m in Sources */ = {isa = PBXBuildFile; fileRef = 13723B4F1A82FD3C00F88898 /* RCTStatusBarManager.m */; };
@@ -2470,6 +2471,7 @@
 				2D3B5EA71D9B08CE00451313 /* RCTTouchHandler.m in Sources */,
 				3D05745A1DE5FFF500184BB4 /* RCTJavaScriptLoader.mm in Sources */,
 				2D3B5EA41D9B08C200451313 /* RCTPerformanceLogger.m in Sources */,
+				2D7FEB891E734B5700D3238C /* systemJSCWrapper.cpp in Sources */,
 				2D3B5E9E1D9B08AD00451313 /* RCTJSStackFrame.m in Sources */,
 				2D3B5E941D9B087900451313 /* RCTBundleURLProvider.m in Sources */,
 				2D3B5EB81D9B091B00451313 /* RCTSourceCode.m in Sources */,