PlugIn: use _binaryLoadable instead of _urlExists

Use _binaryLoadable to ensure that the path exists rather than
_urlExists.

Author: compnerd

CoreFoundation/PlugIn.subproj/CFBundle_Executable.c

@@ -119,7 +119,7 @@ static CFURLRef _CFBundleCopyExecutableURLRaw(CFURLRef urlPath, CFStringRef exeN
 #elif DEPLOYMENT_TARGET_WINDOWS
     if (!executableURL) {
         executableURL = CFURLCreateWithFileSystemPathRelativeToBase(kCFAllocatorSystemDefault, exeName, kCFURLWindowsPathStyle, false, urlPath);
-        if (executableURL && !_urlExists(executableURL)) {
+        if (executableURL && !_binaryLoadable(executableURL)) {
             CFRelease(executableURL);
             executableURL = NULL;
         }