qbs build: Add missing defines

The string concatenation macros were not set, as opposed to the qmake
build.

Change-Id: I32e2c72c891419ef8352cb7b46e3b7f9b82b6312
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

qbs/imports/QtcAutotest.qbs

@@ -15,7 +15,11 @@ QtcProduct {
         project.buildDirectory + '/' + qtc.ide_library_path,
         project.buildDirectory + '/' + qtc.ide_plugin_path
     ]
-    cpp.defines: base.filter(function(d) { return d != "QT_RESTRICTED_CAST_FROM_ASCII"; })
+    cpp.defines: base.filter(function(d) {
+        return d !== "QT_RESTRICTED_CAST_FROM_ASCII"
+            && d !== "QT_USE_FAST_OPERATOR_PLUS"
+            && d !== "QT_USE_FAST_CONCATENATION";
+    })
 
     Group {
         fileTagsFilter: product.type

qbs/modules/qtc/qtc.qbs

@@ -76,6 +76,8 @@ Module {
         "QT_NO_CAST_TO_ASCII",
         "QT_RESTRICTED_CAST_FROM_ASCII",
         "QT_DISABLE_DEPRECATED_BEFORE=0x050600",
+        "QT_USE_FAST_OPERATOR_PLUS",
+        "QT_USE_FAST_CONCATENATION",
     ].concat(testsEnabled ? ["WITH_TESTS"] : [])
 
     Rule {