Macros starting with `x' in netccitt

• X25CSBITS netccitt/pk_var.h:199
• X25GBITS netccitt/pk_var.h:197
• X25SBITS netccitt/pk_var.h:198
• XIFA netccitt/pk_llcsubr.c:122
• XTRACTPKP netccitt/pk_llcsubr.c:113