Use faster string functions at startup.

Use faster string functions at startup.

Use wmem_strconcat and g_strconcat instead of wmem_strdup_printf and
g_strdup_printf when we register various protocols. This shows a fairly
significant speedup in the Visual Studio profiler.

Change-Id: I98709329513daa66ad3665925dc69149c43df884
Reviewed-on: https://code.wireshark.org/review/14855
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>