netstring-pcre: removing dependency on camlp4


git-svn-id: https://godirepo.camlcity.org/svn/lib-ocamlnet2/trunk/code@2048 96e5b9e0-aa12-0410-9e2e-b23d24e56262
3.7.6


git-svn-id: https://godirepo.camlcity.org/svn/lib-ocamlnet2/trunk/code@2049 96e5b9e0-aa12-0410-9e2e-b23d24e56262