Log Message:
Changes 2.1.6:
Fixed
- src/kernel/sparcv8/MakeVar.SH missing from MANIFEST (hence from tarball)
- stack corruption in matsnf() [ when GC occurs ]
- incorrect result in gaffsg(s < 0, t_PADIC)
- [hi-res plot: X-Windows] rescaling bug
- [ix86 + gcc]: fix "invalid preprocessing token" Warning
- removed hack in buchall()  [ function called through unappropriate
  type (in init mode) to avoid inserting irrelevant arguments ]. Caused
  some compiler to produce incorrect code (SEGV).
- typo in isabsolutepol(): SEGV in factorff for some t_POLs
  defined over the prime field
- inconsistent error message when starting 'gp -p 436273000'
- Configure support for GNU/Hurd