SL-821: Add LL_TO_WSTRING() macro to llpreprocessor.h.

Also use existing LL_TO_STRING() macro to stringize LL_VIEWER_CHANNEL in
llversioninfo.cpp and its tests.

indra/llcommon/llpreprocessor.h

@@ -198,6 +198,8 @@
 
 #define LL_TO_STRING_HELPER(x) #x
 #define LL_TO_STRING(x) LL_TO_STRING_HELPER(x)
+#define LL_TO_WSTRING_HELPER(x) L#x
+#define LL_TO_WSTRING(x) LL_TO_WSTRING_HELPER(x)
 #define LL_FILE_LINENO_MSG(msg) __FILE__ "(" LL_TO_STRING(__LINE__) ") : " msg
 #define LL_GLUE_IMPL(x, y) x##y
 #define LL_GLUE_TOKENS(x, y) LL_GLUE_IMPL(x, y)

indra/newview/llversioninfo.cpp

@@ -101,14 +101,11 @@ namespace
 {
 	// LL_VIEWER_CHANNEL is a macro defined on the compiler command line. The
 	// macro expands to the string name of the channel, but without quotes. We
-	// need to turn it into a quoted string. This macro trick does that.
-#define stringize_inner(x) #x
-#define stringize_outer(x) stringize_inner(x)
-
+	// need to turn it into a quoted string. LL_TO_STRING() does that.
 	/// Storage of the channel name the viewer is using.
 	//  The channel name is set by hardcoded constant, 
 	//  or by calling LLVersionInfo::resetChannel()
-	std::string sWorkingChannelName(stringize_outer(LL_VIEWER_CHANNEL));
+	std::string sWorkingChannelName(LL_TO_STRING(LL_VIEWER_CHANNEL));
 
 	// Storage for the "version and channel" string.
 	// This will get reset too.

indra/newview/tests/llversioninfo_test.cpp

@@ -33,10 +33,8 @@
 
 // LL_VIEWER_CHANNEL is a macro defined on the compiler command line. The
 // macro expands to the string name of the channel, but without quotes. We
-// need to turn it into a quoted string. This macro trick does that.
-#define stringize_inner(x) #x
-#define stringize_outer(x) stringize_inner(x)
-#define ll_viewer_channel stringize_outer(LL_VIEWER_CHANNEL)
+// need to turn it into a quoted string. LL_TO_STRING() does that.
+#define ll_viewer_channel LL_TO_STRING(LL_VIEWER_CHANNEL)
 
 namespace tut
 {