Fixed prefix path for FHS Installed Bundles

- Updated Bundle.url(forAuxiliaryExecutable:) return type as URL
- Added FindExecutable test in TestBundle
- Cleaned TestBundle.swift

Author: pvieito

CoreFoundation/PlugIn.subproj/CFBundle_Executable.c

@@ -207,13 +207,15 @@ static CFURLRef _CFBundleCopyExecutableURLInDirectory2(CFBundleRef bundle, CFURL
             if (lookupMainExe && bundle && bundle->_isFHSInstalledBundle) {
                 // For a FHS installed bundle, the URL points to share/Bundle.resources, and the binary is in:
 
-                CFURLRef prefix = CFURLCreateCopyDeletingLastPathComponent(kCFAllocatorSystemDefault, url);
-                
+                CFURLRef sharePath = CFURLCreateCopyDeletingLastPathComponent(kCFAllocatorSystemDefault, url);
+                CFURLRef prefixPath = CFURLCreateCopyDeletingLastPathComponent(kCFAllocatorSystemDefault, sharePath);
+                CFRelease(sharePath);
+
                 CFStringRef directories[] = { _CFBundleFHSDirectoriesInExecutableSearchOrder };
                 size_t directoriesCount = sizeof(directories) / sizeof(directories[0]);
 
                 for (size_t i = 0; i < directoriesCount; i++) {
-                    CFURLRef where = CFURLCreateCopyAppendingPathComponent(kCFAllocatorSystemDefault, prefix, directories[i], true);
+                    CFURLRef where = CFURLCreateCopyAppendingPathComponent(kCFAllocatorSystemDefault, prefixPath, directories[i], true);
                     executableURL = _CFBundleCopyExecutableURLRaw(where, executableName);
                     CFRelease(where);
 
@@ -223,7 +225,7 @@ static CFURLRef _CFBundleCopyExecutableURLInDirectory2(CFBundleRef bundle, CFURL
                     }
                 }
 
-                CFRelease(prefix);
+                CFRelease(prefixPath);
             }
 #endif // !DEPLOYMENT_RUNTIME_OBJC && !DEPLOYMENT_TARGET_WINDOWS
 
@@ -290,11 +292,7 @@ static CFURLRef _CFBundleCopyExecutableURLInDirectory2(CFBundleRef bundle, CFURL
             if (lookupMainExe && !ignoreCache && bundle && executableURL) {
                 // We found it.  Cache the path.
                 CFURLRef absURL = CFURLCopyAbsoluteURL(executableURL);
-#if DEPLOYMENT_TARGET_WINDOWS
-                executablePath = CFURLCopyFileSystemPath(absURL, kCFURLWindowsPathStyle);
-#else
-                executablePath = CFURLCopyFileSystemPath(absURL, kCFURLPOSIXPathStyle);
-#endif
+                executablePath = CFURLCopyFileSystemPath(absURL, PLATFORM_PATH_STYLE);
                 CFRelease(absURL);
                 __CFLock(&bundle->_lock);
                 bundle->_executablePath = (CFStringRef)CFRetain(executablePath);

Foundation/Bundle.swift

@@ -115,8 +115,8 @@ open class Bundle: NSObject {
         return CFBundleCopyExecutableURL(_bundle)?._swiftObject
     }
 
-    open func url(forAuxiliaryExecutable executableName: String) -> NSURL? {
-        return CFBundleCopyAuxiliaryExecutableURL(_bundle, executableName._cfObject)?._nsObject
+    open func url(forAuxiliaryExecutable executableName: String) -> URL? {
+        return CFBundleCopyAuxiliaryExecutableURL(_bundle, executableName._cfObject)?._swiftObject
     }
 
     open var privateFrameworksURL: URL? {