Commented out export of missing CRML source file to avoid build error.
There are no known side effects of this file being missing, so this seems a reasonable way to avoid the build error.
#include <openssl/bio.h>
#if BIO_FLAGS_UPLINK==0
/* Shortcut UPLINK calls on most platforms... */
#define UP_stdin stdin
#define UP_stdout stdout
#define UP_stderr stderr
#define UP_fprintf fprintf
#define UP_fgets fgets
#define UP_fread fread
#define UP_fwrite fwrite
#undef UP_fsetmod
#define UP_feof feof
#define UP_fclose fclose
#define UP_fopen fopen
#define UP_fseek fseek
#define UP_ftell ftell
#define UP_fflush fflush
#define UP_ferror ferror
#define UP_fileno fileno
#define UP_open open
#define UP_read read
#define UP_write write
#define UP_lseek lseek
#define UP_close close
#endif