Log Message:
pkgtools/pkglint: update to 5.6.5

Changes since 5.6.4:

* GCC_REQD should only contain the major version. For GCC versions up to
  4.x, this consists of the first two numbers, such as 4.8, while starting
  with the 5.x series, the major version is only the first number, such as
  7.