[packages/R] (5 commits) ...- handle i686 case: either build with sse2 math or disable test failing with 387 math

[qboosh]

Summary of changes:

  110ae00... - up to 4.2.3, one test fails (*)
  db28e9d... - up to 4.3.3, test still fails (*)
  1aecac1... - up to 4.4.1, test still fails (*)
  73a4486... - updated to 4.4.3; regtests still fail on i686 with x87 ma (*)
  e0814a1... - handle i686 case: either build with sse2 math or disable  (*)

(*) This commit already existed in another branch; no separate mail sent