dev-ml: import compilation fixups from local overlay

Unfortunately I can't recall the precise issue this was to solve.

dev-ml/ocamlnet/Manifest

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+DIST ocamlnet-4.1.6.tar.gz 4588117 BLAKE2B e6edfee28fc0fa5e0e9885d1c24eb2f3ef2c0d79ad4e5aa65446180c9af8b86f2c36dd31e027cd52b0fdefd8a9763ae03dad2f125180b7a477f5610308c04585 SHA512 5bd6437f3ffea309c4382b79bbf87cc46c2fa88c5191df7b1d62294ce523aa25ba7fcf41c8c1cfade5396859db209d60b8b00062b103b1cab2761896443bf881

dev-ml/ocamlnet/ocamlnet-4.1.6.ebuild

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+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="5"
+
+inherit eutils findlib
+
+MY_P=${P/_beta/test}
+DESCRIPTION="Modules for OCaml application-level Internet protocols"
+HOMEPAGE="http://projects.camlcity.org/projects/ocamlnet.html"
+SRC_URI="http://download.camlcity.org/download/${MY_P}.tar.gz"
+
+LICENSE="ZLIB GPL-2+"
+SLOT="0/${PV}"
+KEYWORDS="~amd64 ~ppc ~x86 ~x86-fbsd"
+IUSE="gtk kerberos tk httpd +ocamlopt +pcre ssl zip"
+RESTRICT="installsources"
+
+# the auth-dh compile flag has been disabled as well, since it depends on
+# ocaml-cryptgps, which is not available.
+
+RDEPEND=">=dev-ml/findlib-1.0
+		pcre? ( >=dev-ml/pcre-ocaml-5:= )
+		>=dev-lang/ocaml-3.10.2:=[ocamlopt?]
+		tk? ( dev-ml/labltk:= )
+		ssl? ( net-libs/gnutls:= )
+		gtk? ( >=dev-ml/lablgtk-2:= )
+		kerberos? ( virtual/krb5 )
+		zip? ( dev-ml/camlzip:= )
+		"
+DEPEND="${RDEPEND}
+	virtual/pkgconfig
+"
+
+S=${WORKDIR}/${MY_P}
+
+ocamlnet_use_with() {
+	if use $1; then
+		echo "-with-$2"
+	else
+		echo "-without-$2"
+	fi
+}
+
+ocamlnet_use_enable() {
+	if use $1; then
+		echo "-enable-$2"
+	else
+		echo "-disable-$2"
+	fi
+}
+
+src_configure() {
+	./configure \
+		-bindir /usr/bin \
+		-datadir /usr/share/${PN} \
+		$(ocamlnet_use_enable ssl gnutls) \
+		$(ocamlnet_use_enable gtk gtk2) \
+		$(ocamlnet_use_enable kerberos gssapi) \
+		$(ocamlnet_use_enable pcre pcre) \
+		$(ocamlnet_use_enable tk tcl) \
+		$(ocamlnet_use_enable zip zip) \
+		$(ocamlnet_use_with httpd nethttpd) \
+		|| die "Error : econf failed!"
+}
+
+src_compile() {
+	emake -j1 all
+	if use ocamlopt; then
+		emake -j1 opt
+	fi
+}
+
+src_install() {
+	export STRIP_MASK="*/bin/*"
+	findlib_src_install
+}