Error message arguments are not checked at compile time. This may
cause unexpected errors at runtime. This WL creates a CMAKE option
-DCHECK_ERRMSG_FORMAT=1 where the number and type of arguments to
error messages are checked at compile time. This is created as an
option as it only works with the default English language. The
default setting for this option is OFF.

This will rely on the attribution
MY_ATTRIBUTE((format(printf, 2, 0)));
which are effective with gcc, clang, mac and Windows.

This WL will handle the following functions:
my_printf_error
my_printv_error
push_warning_printf
Parse_tree_node_tmpl<Context>::errorf()
snprintf()
my_safe_snprintf()
my_safe_printf_stderr()

This will only cover calls where the error-code is not a variable
for the time being. There are some cases where the error-code is
non-const where we have % substitutions. This will only cover
messages to the client.

Change-Id: Iffb1c226875f84d944faabf5ee4c50361d8a6434