Include Swift lib in LIBRARY_SEARCH_PATHS

Summary:
changelog: Fix Xcode 13 build error in RNTester

Including `usr/lib/swift` fixes error:
{F642876047}

Reviewed By: fkgozali

Differential Revision: D30559838

fbshipit-source-id: 65aad16b550d156c8670eaefcc8bedae99606329

Author: Luna Wei

packages/rn-tester/RNTesterPods.xcodeproj/project.pbxproj

@@ -787,6 +787,7 @@
 					"$(inherited)",
 					"$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)",
 					"$(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME)",
+					"\"$(SDKROOT)/usr/lib/swift\"",
 				);
 				"LIBRARY_SEARCH_PATHS[arch=*]" = "$(inherited)";
 				OTHER_LDFLAGS = (
@@ -821,6 +822,7 @@
 					"$(inherited)",
 					"$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)",
 					"$(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME)",
+					"\"$(SDKROOT)/usr/lib/swift\"",
 				);
 				OTHER_LDFLAGS = (
 					"$(inherited)",