[xcodeproj] Better lit output

Because Xcode treats the default lit output as error, simply running
`lit Tests/Functional` causes build failures in Xcode. For this reason,
the script was run with the `-q` quiet parameter. However, this made it
difficult to understand why a test failed.

This commit borrows a page from LLVM (see: https://github.com/apple/swift-llvm/blob/3ebdbb2c7e5ce577363994fd0aa0f8409bc68490/CMakeLists.txt#L329-L332)
and uses `-s` (summarize results), `-v` (verbose), and
`--no-progress-bar`. This combination emits diagnostics that are not
treated as errors by Xcode, *and* they provide a great deal of detail
when tests fail--the best of both worlds!

Author: modocache

XCTest.xcodeproj/project.pbxproj

@@ -189,7 +189,7 @@
 /* Begin PBXLegacyTarget section */
 		DAA333B51C267AD6000CC115 /* SwiftXCTestFunctionalTests */ = {
 			isa = PBXLegacyTarget;
-			buildArgumentsString = "-q Tests/Functional";
+			buildArgumentsString = "-sv --no-progress-bar Tests/Functional";
 			buildConfigurationList = DAA333B81C267AD6000CC115 /* Build configuration list for PBXLegacyTarget "SwiftXCTestFunctionalTests" */;
 			buildPhases = (
 			);