cscope security update

[15.5-10.RHEL4.3]

• Merge incdir-overflow and snprintf patches for better readability,
  snprintf is used now with PATHLEN limit without other adjustments,
  related strlen / %.*s / *_len are no longer needed and were dropped
• Update tempsec patch, drop extraneous s(n)printf argument
  to suppress compiler warnings
• Update fscanf-overflows patch to perform reffile argument length
  check earlier
• Fixing some snprintf formatting errors
• Fixing buffer overlows (bz 499198)
• Fixed some additional sprintf overflows