lukem/build and man fixes

[lukem]

Various fixes & improvements:

• update my references to just my name, including removing old email addresses
• adapt how HAVE_WORKING_SBRK is tested to be consistent with the existing style, and avoid gcc -Wundef
• tcsh.man:
  • Use Ic for key names
  • add a few more subsection headers to make it easier to find stuff
• finish the deprecation of tcsh.man2html
• avoid creating gethost.dSYM on macOS builds

[zoulasc]

committed!