Fix LogcatTextWriter_Log interpreting messages it logs, potentially w…

…riting random garbage and/or crashing (mono/mono#9606)

(introduced by https://github.com/mono/mono/commit/mono/mono@984f6484666c2ee6fefec949c81fdff1189c9488)
(Fixes dotnet/android#1951)

Commit migrated from mono/mono@d307070

src/mono/mono/metadata/icall.c

@@ -7959,7 +7959,7 @@ ves_icall_System_Runtime_InteropServices_WindowsRuntime_UnsafeNativeMethods_Wind
 ICALL_EXPORT void
 ves_icall_System_IO_LogcatTextWriter_Log (const char *appname, gint32 level, const char *message)
 {
-	g_log (appname, (GLogLevelFlags)level, message);
+	g_log (appname, (GLogLevelFlags)level, "%s", message);
 }
 
 static MonoIcallTableCallbacks icall_table;