Remove print statement

This ends up polluting the output of `swift test` quite a bit and
doesn't seem very useful. I am assuming it was just accidentally left
there.

Author: neonichu

Sources/SPMTestSupport/XCTAssertHelpers.swift

@@ -32,7 +32,6 @@ public func XCTAssertBuilds(
 ) {
     for conf in configurations {
         do {
-            print("    Building \(conf)")
             _ = try executeSwiftBuild(
                 path,
                 configuration: conf,