Add builtin_object_size() checks

Closes #1508.

This has implementation for g_strlcpy() with builtin_object_size() check.

• Update g_strlcpy() to glib_g_strlcpy() and its implementation to have __attribute__(alias)
• Add separate gstrfuncschk.c file and define the chk method aborting if size is less otherwise calling glib_g_strlcpy()
• Define g_strlcpy() to call check with _builtin_object_size().

If this looks good I will go ahead with the following:

• g_utf8_strlen()
• g_utf8_strncpy()
• g_utf8_strchr()
• mostly here, memory functions
• g_slice_copy()
• g_slice_dup()