MFC r274075,r274581,r274582,r274595:

MFC r274075,r274581,r274582,r274595:

r274075 (by ngie):

  Add reachover Makefiles for contrib/netbsd-tests/lib/libc; this adds approximately
  500 new testcases

  Various TODOs have been sprinkled around the Makefiles for items that even need
  to be ported (missing features), testcases have issues with building/linking, or
  issues at runtime.

  A variant of this code has been tested extensively on amd64 and i386
  10-STABLE/11-CURRENT for several months without issue. It builds on other
  architectures, but the code will remain off until I have prove it works on
  virtual hardware or real hardware on other architectures

  In collaboration with: pho, Casey Peel <casey.peel@isilon.com>
  Sponsored by: EMC / Isilon Storage Division

r274581 (by ngie):

  Convert tools/regression/lib/libc/gen/test-arc4random into an ATF testcase and
  rename as lib/libc/gen/arc4random_test

  Sponsored by: EMC / Isilon Storage Division

r274582 (by ngie):

  Remove test-arc4random from this Makefile so others can continue to use
  this as-is for the time being

r274595 (by ngie):

  Convert tools/regression/lib/libc/stdio/test-fpclassify into an ATF testcase and
  Rename as lib/libc/stdio/fpclassify2_test

  Sponsored by: EMC / Isilon Storage Division

git-svn-id: svn://svn.freebsd.org/base/stable/10@277441 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f