MFC 227429,228121,228124,228137,228140,228141,228147,228153,228158,228311,

MFC 227429,228121,228124,228137,228140,228141,228147,228153,228158,228311,
241395,241396:
Various fixes to WITH_CTF:
- Conditionalize ctfconvert/ctfmerge runs on make level (.if/.endif)
  instead of executing a shell on every object or executable/library file.
- CTF knob is now implemented using common scheme: MK_CTF=yes/no is
  defined based on WITH/WITHOUT_CTF settings, default is WITHOUT_CTF,
  NO_CTF overrides WITH_CTF (used by Makefile.inc1)
- Add missing calls to ctfconvert/ctfmerge for various edge cases.

git-svn-id: svn://svn.freebsd.org/base/stable/9@241711 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f