Add devel/erlang-gpb, a Google Protobuf implementation for Erlang.

We already had devel/erlang-protobuffs, but this is used by the Elixir
Protobuf port too.

devel/Makefile

@@ -449,6 +449,7 @@
     SUBDIR += erlang-gen_smtp
     SUBDIR += erlang-getopt
     SUBDIR += erlang-goldrush
+    SUBDIR += erlang-gpb
     SUBDIR += erlang-gproc
     SUBDIR += erlang-jobs
     SUBDIR += erlang-jsx

devel/erlang-gpb/Makefile

+# $FreeBSD$
+
+PORTNAME=	gpb
+PORTVERSION=	3.18.6
+CATEGORIES=	devel
+PKGNAMEPREFIX=	erlang-
+
+MAINTAINER=	olgeni@FreeBSD.org
+COMMENT=	Google Protobuf implementation for Erlang
+
+LICENSE=	LGPL21
+
+USES=		erlang:rebar
+USE_GITHUB=	yes
+GH_ACCOUNT=	tomas-abrahamsson
+GH_PROJECT=	gpb
+
+.include <bsd.port.mk>

devel/erlang-gpb/distinfo

+SHA256 (tomas-abrahamsson-gpb-3.18.6_GH0.tar.gz) = f5163c35813c4460df5d33fe89d35d1e6d9d971c03abeeef933af38bf49f522a
+SIZE (tomas-abrahamsson-gpb-3.18.6_GH0.tar.gz) = 283698

devel/erlang-gpb/files/patch-build_mk__version__hrl

+--- build/mk_version_hrl.orig	2015-07-14 10:15:12 UTC
++++ build/mk_version_hrl
+@@ -1,7 +1,6 @@
+ #! /bin/sh
+ 
+ sed \
+-    -e "s/@vsn@/`git describe --always --tags --match '[0-9]*.[0-9]*'`/g" \
+     -e "s/is expected to be/was/g" \
+     -e '/^%% The version below/ i \
+ %% DO NOT EDIT -- generated from gpb_version.hrl.in' \

devel/erlang-gpb/files/patch-include_gpb__version.hrl.in

+--- include/gpb_version.hrl.in.orig	2015-07-14 10:14:25 UTC
++++ include/gpb_version.hrl.in
+@@ -5,6 +5,6 @@
+ %% at build-time, see the rebar.config or the Makefile
+ %% NB: The build/mk_version_hrl depends on the exact wording
+ 
+--define(gpb_version, "@vsn@").
++-define(gpb_version, "%%PORTVERSION%%").
+ 
+ -endif. %% gpb_version_hrl

devel/erlang-gpb/pkg-descr

+Compiler for Google protocol buffer definitions files for Erlang.
+
+WWW: https://github.com/tomas-abrahamsson/gpb

devel/erlang-gpb/pkg-plist

+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb.app
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb.beam
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb_codegen.beam
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb_compile.beam
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb_compile_descr.beam
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb_descriptor.beam
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb_parse.beam
+lib/erlang/lib/gpb-%%VERSION%%/ebin/gpb_scan.beam
+lib/erlang/lib/gpb-%%VERSION%%/include/gpb.hrl
+lib/erlang/lib/gpb-%%VERSION%%/include/gpb_version.hrl
+lib/erlang/lib/gpb-%%VERSION%%/include/gpb_version.hrl.in
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb.app.src
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb.erl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_codegen.erl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_codegen.hrl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_compile.erl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_parse.erl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_parse.yrl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_scan.erl
+lib/erlang/lib/gpb-%%VERSION%%/src/gpb_scan.xrl
+%%PORTDOCS%%%%DOCSDIR%%/README.md
+%%PORTDOCS%%%%DOCSDIR%%/README.nif-cc