In sight of long-overdue update of `lang/ocaml', start cleaning things up:

• Remove hunks from `patch-configure' that are irrelevant on *BSD
• Do not aggressively edit configure script in post-patch', especially when it is not required (e.g. no variables are expanded). This was the reason for bogus changes committed in r403835 by wen@ and r403898 by marino@ (cf. "$bytecclinkopts $bytecclinkopts $bytecclinkopts"); now `make makepatch'' command is idempotent again
• Do not needlessly pass STAGEDIR via MAKE_ENV: it is correctly passed via MAKE_ARGS (as DESTDIR), and OCaml's build system is aware of it, while nowhere referencing STAGEDIR variable
• Drop permission fix for ld.conf that was added in r169472 by itetcu@ 11 years 4 months ago: it is no-op these days

Build logs remain identical (modulo the whitespace), regression tests pass.