version_info: fix clang output.

Clang's __VERSION__ shows a trailing space. This ends up in a useless
space before the period, that shows a different output from other
compilers. Example:

Built using clang Clang 10.0.0 .
Built using gcc 7.5.0.

Fixed by stripping it in clang only.

Change-Id: I98dfce46b189fc6b2b58950dbb27f69d271bd729
Reviewed-on: https://code.wireshark.org/review/37480
Petri-Dish: Guy Harris <[email protected]>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <[email protected]>
Reviewed-by: Anders Broman <[email protected]>

Author: crondaemon

version_info.c

@@ -328,8 +328,13 @@ get_compiler_info(GString *str)
   #if defined(__clang__)
 	/*
 	 * We know this isn't clang/C2, as _MSC_FULL_VER isn't defined.
+	 *
+	 * Strip out trailing space from clang's __VERSION__ to be consistent
+	 * with other compilers.
 	 */
-	g_string_append_printf(str, "\n\nBuilt using clang %s.\n", __VERSION__);
+	gchar* version = g_strstrip(g_strdup(__VERSION__));
+	g_string_append_printf(str, "\n\nBuilt using clang %s.\n", version);
+	g_free(version);
   #elif defined(__llvm__)
 	/* llvm-gcc */
 	g_string_append_printf(str, "\n\nBuilt using llvm-gcc %s.\n", __VERSION__);