Bug#869207: ocaml-visitors: FTBFS: ocamlfind: ocamlopt not supported

["Aaron M. Ucko" <ucko@debian.org>]

Source: ocaml-visitors
Version: 20170404-1
Severity: important
Justification: fails to build from source

Builds of ocaml-visitors for a number of architectures failed with

  + ocamlfind ocamlopt -c -g -safe-string -package compiler-libs.common -package ppx_deriving.api -w A-4-44 -package result -o VisitorsPlugin.cmx VisitorsPlugin.ml
  ocamlfind: Not supported in your configuration: ocamlopt
  Command exited with code 2.
  Makefile:39: recipe for target 'all' failed
  make[2]: *** [all] Error 10
  make[2]: Leaving directory '/<<PKGBUILDDIR>>/src'
  Makefile:4: recipe for target 'all' failed
  make[1]: *** [all] Error 2
  make[1]: Leaving directory '/<<PKGBUILDDIR>>'
  debian/rules:12: recipe for target 'build-arch' failed
  make: *** [build-arch] Error 2

Per https://buildd.debian.org/status/logs.php?pkg=ocaml-visitors&ver=20170404-1,
this error has occurred so far on mips, mips64el, mipsel, ppc64el,
s390x, and the non-release architectures alpha, hppa, m68k, ppc64,
sparc64, and x32.  Please either accommodate these architectures or
adjust your Architecture (or, if possible, Build-Depends) field to
exclude them.

Thanks!

-- 
Aaron M. Ucko, KB1CJC (amu at alum.mit.edu, ucko at debian.org)
http://www.mit.edu/~amu/ | http://stuff.mit.edu/cgi/finger/?amu@monk.mit.edu