Replace unneeded #ifdef.

Change-Id: I2ff32f7013fc863d998a8317d4c409a9a2c295c1
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/libs/utils/fileutils.cpp

@@ -293,15 +293,15 @@ bool FileUtils::isRelativePath(const QString &path)
 {
     if (path.startsWith(QLatin1Char('/')))
         return false;
-#ifdef Q_OS_WIN
-    if (path.startsWith(QLatin1Char('\\')))
-        return false;
-    // Unlike QFileInfo, this won't accept a relative path with a drive letter.
-    // Such paths result in a royal mess anyway ...
-    if (path.length() >= 3 && path.at(1) == QLatin1Char(':') && path.at(0).isLetter()
-        && (path.at(2) == QLatin1Char('/') || path.at(2) == QLatin1Char('\\')))
-        return false;
-#endif
+    if (HostOsInfo::isWindowsHost()) {
+        if (path.startsWith(QLatin1Char('\\')))
+            return false;
+        // Unlike QFileInfo, this won't accept a relative path with a drive letter.
+        // Such paths result in a royal mess anyway ...
+        if (path.length() >= 3 && path.at(1) == QLatin1Char(':') && path.at(0).isLetter()
+                && (path.at(2) == QLatin1Char('/') || path.at(2) == QLatin1Char('\\')))
+            return false;
+    }
     return true;
 }