update test that was failing on linux

Author: bkhouri

Sources/_InternalTestSupport/BuildSystemProvider+Configuration.swift

@@ -18,7 +18,7 @@ extension BuildSystemProvider.Kind {
     public func binPathSuffixes(for config: BuildConfiguration) -> [String] {
         let suffix: String
 
-        #if os(linux)
+        #if os(Linux)
         suffix = "-linux"
         #elseif os(Windows)
         suffix  = "-windows"