Make Foundation compile in Xcode again

- The code is still using version 3 syntax so pass the
  -swift-version 3 flag

Author: spevans

Foundation.xcodeproj/project.pbxproj

@@ -2500,7 +2500,7 @@
 					r,
 					r,
 				);
-				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH -DDEPLOYMENT_RUNTIME_SWIFT";
+				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH -DDEPLOYMENT_RUNTIME_SWIFT  -swift-version 3";
 				PRODUCT_BUNDLE_IDENTIFIER = org.swift.Foundation;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -2572,7 +2572,7 @@
 					r,
 					r,
 				);
-				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH -DDEPLOYMENT_RUNTIME_SWIFT";
+				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH -DDEPLOYMENT_RUNTIME_SWIFT  -swift-version 3";
 				PRODUCT_BUNDLE_IDENTIFIER = org.swift.Foundation;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -2676,7 +2676,7 @@
 				INFOPLIST_FILE = TestFoundation/Resources/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				MACH_O_TYPE = mh_execute;
-				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH";
+				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH  -swift-version 3";
 				PRODUCT_BUNDLE_IDENTIFIER = org.swift.TestFoundation;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -2700,7 +2700,7 @@
 				INFOPLIST_FILE = TestFoundation/Resources/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				MACH_O_TYPE = mh_execute;
-				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH";
+				OTHER_SWIFT_FLAGS = "-DDEPLOYMENT_ENABLE_LIBDISPATCH  -swift-version 3";
 				PRODUCT_BUNDLE_IDENTIFIER = org.swift.TestFoundation;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;