protobuf_grpc: google serializing and RPC library

protobuf : 3.9.3
grpc     : 1.24.0

This a new version of the port with a vastly reduced port size.

Issue #190

ports/protobuf_grpc-host.port

@@ -0,0 +1,39 @@
+LICENSE             := GPLv2
+VERSION             := 19.09
+
+DOWNLOADS           := grpc.archive
+DOWNLOADS           += protobuf.archive
+DOWNLOADS           += cares.archive
+DOWNLOADS           += gflags.archive
+
+#
+# !!! IMPORTANT !!!
+# PROTOBUF_VERSION must match the version that gRPC uses in the
+# third_party/protobuf sub directory!
+#
+GRPC_VERSION        := 1.24.3
+PROTOBUF_VERSION    := 3.9.1
+CARES_VERSION       := 1_15_0
+GFLAGS_VERSION      := 2.2.2
+
+URL(grpc)           := https://github.com/grpc/grpc/archive/v$(GRPC_VERSION).tar.gz
+DIR(grpc)           := src/lib/grpc-host
+SHA(grpc)           := c84b3fa140fcd6cce79b3f9de6357c5733a0071e04ca4e65ba5f8d306f10f033
+REV(grpc)           := $(GRPC_VERSION)
+
+URL(protobuf)       := https://github.com/protocolbuffers/protobuf/releases/download/v$(PROTOBUF_VERSION)/protobuf-cpp-$(PROTOBUF_VERSION).tar.gz
+DIR(protobuf)       := src/lib/grpc-host/third_party/protobuf
+SHA(protobuf)       := 29a1db3b9bebcf054c540f13400563120ff29fbdd849b2c7a097ffe9d3d508eb
+REV(protobuf)       := $(PROTOBUF_VERSION)
+
+URL(cares)          := https://github.com/c-ares/c-ares/archive/cares-$(CARES_VERSION).tar.gz
+DIR(cares)          := src/lib/grpc-host/third_party/cares/cares
+SHA(cares)          := 7deb7872cbd876c29036d5f37e30c4cbc3cc068d59d8b749ef85bb0736649f04
+REV(cares)          := $(CARES_VERSION)
+
+URL(gflags)         := https://github.com/gflags/gflags/archive/v$(GFLAGS_VERSION).tar.gz
+DIR(gflags)         := src/lib/grpc-host/third_party/gflags
+SHA(gflags)         := 34af2f15cf7367513b352bdcd2493ab14ce43692d2dcd9dfc499492966c64dcf
+REV(gflags)         := $(GFLAGS_VERSION)
+
+# vim: syntax=make