Resolve ambiguity warning regarding use of && and ||.

This is not ambiguous to the compiler, but it may seem ambiguous to
the reader.

From reading 3a53005f (Build object library targets in VS), 5484550a
(Detect and set Unicode character set in VS 10), and 9e01aefd (VS:
Add support for WinRT project properties (#12930)), this appears to
be the intentional semantic.

Source/cmVisualStudio10TargetGenerator.cxx

@@ -428,8 +428,8 @@ void cmVisualStudio10TargetGenerator::WriteProjectConfigurationValues()
     mfcLine += useOfMfcValue + "</UseOfMfc>\n";
     this->WriteString(mfcLine.c_str(), 2);
 
-    if(this->Target->GetType() <= cmTarget::OBJECT_LIBRARY &&
-       this->ClOptions[*i]->UsingUnicode() ||
+    if((this->Target->GetType() <= cmTarget::OBJECT_LIBRARY &&
+       this->ClOptions[*i]->UsingUnicode()) ||
        this->Target->GetPropertyAsBool("VS_WINRT_EXTENSIONS"))
       {
       this->WriteString("<CharacterSet>Unicode</CharacterSet>\n", 2);