patch: use internal ccopts variable

[ecc1]

I apply this patch in the Debian packaging of ocaml-sha; please consider it for the upstream version.

http://anonscm.debian.org/gitweb/?p=pkg-ocaml-maint/packages/ocaml-sha.git;a=blob_plain;f=debian/patches/0003-use-internal-ccopts-variable.patch;hb=HEAD