Reenable disabled tests

These tests were disabled but proven working again.

rdar://101868275

Author: neonichu

Tests/CommandsTests/BuildToolTests.swift

@@ -280,7 +280,7 @@ final class BuildToolTests: CommandsTestCase {
     }
 
     func testBuildCompleteMessage() throws {
-        throw XCTSkip("This test fails to match the 'Compiling' regex; rdar://101815761")
+        throw XCTSkip("This test isn't stable w.r.t. the build cache; rdar://101815761")
 
         try fixture(name: "DependencyResolution/Internal/Simple") { fixturePath in
             do {

Tests/WorkspaceTests/InitTests.swift

@@ -266,8 +266,6 @@ class InitTests: XCTestCase {
     }
 
     func testNonC99NameExecutablePackage() throws {
-        throw XCTSkip("This test fails to find XCTAssertEqual; rdar://101868275")
-
         try withTemporaryDirectory(removeTreeOnDeinit: true) { tempDirPath in
             XCTAssertDirectoryExists(tempDirPath)
 

Tests/WorkspaceTests/WorkspaceTests.swift

@@ -4291,8 +4291,6 @@ final class WorkspaceTests: XCTestCase {
 
     // This verifies that the simplest possible loading APIs are available for package clients.
     func testSimpleAPI() throws {
-        throw XCTSkip("This test fails to find XCTAssertEqual; rdar://101868275")
-
         try testWithTemporaryDirectory { path in
             // Create a temporary package as a test case.
             let packagePath = path.appending(component: "MyPkg")