qmljs: put file specific logs in anonymous namespace

putting file specific log categories in anonymous namespace
avoid the possibility of nameclashes.

Change-Id: I17a07015ffe1c539824fcfcbc2296335d9225dd1
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/libs/qmljs/qmljsimportdependencies.cpp

@@ -38,9 +38,11 @@
 
 #include <algorithm>
 
-namespace QmlJS {
-
+namespace {
 Q_LOGGING_CATEGORY(importsLog, "qtc.qmljs.imports")
+}
+
+namespace QmlJS {
 
 ImportKind::Enum toImportKind(ImportType::Enum type)
 {