Add Google Protocol Buffers as a 3prd party package for RTEMS.

https://developers.google.com/protocol-buffers/

source-builder/config/protobuf-2-1.cfg

@@ -0,0 +1,73 @@
+#
+# Google Protocol Buffers 2.x.x Version 1.
+#
+# This configuration file configure's, make's and install's Protocol Buffers
+#
+
+%if %{release} == %{nil}
+%define release 1
+%endif
+
+Name:      protobuf-%{protobuf_version}-%{_host}-%{release}
+Summary:   Protocol buffers are Googles language-neutral,
+           platform-neutral, extensible mechanism for serializing
+           structured data.
+Version:   %{protobuf_version}
+Release:   %{release}
+URL: 	   https://developers.google.com/protocol-buffers/
+BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
+
+#
+# Protocol Buffers Source
+#
+%source set protobuf https://github.com/google/protobuf/releases/download/v%{protobuf_version}/protobuf-%{protobuf_version}.tar.gz
+
+#
+# Prepare the source code.
+#
+%prep
+  build_top=$(pwd)
+
+  source_dir_protobuf="protobuf-%{protobuf_version}"
+  %source setup protobuf -q -n protobuf-%{protobuf_version}
+  %patch setup protobuf -p1
+
+  cd ${build_top}
+
+%build
+  build_top=$(pwd)
+
+  %{build_directory}
+
+  mkdir -p ${build_dir}
+  cd ${build_dir}
+
+  %define host_cxxflags %{host_cxxflags} -fpermissive
+
+  %{host_build_flags}
+
+  ../${source_dir_protobuf}/configure \
+    --host=%{_host} \
+    --prefix=%{_prefix} \
+    --bindir=%{_bindir} \
+    --exec_prefix=%{_exec_prefix} \
+    --includedir=%{_includedir} \
+    --libdir=%{_libdir} \
+    --libexecdir=%{_libexecdir} \
+    --mandir=%{_mandir} \
+    --infodir=%{_infodir} \
+    --datadir=%{_datadir} \
+    --with-protoc=true
+
+  %{__make} %{?_smp_mflags} all
+
+  cd ${build_top}
+
+%install
+  build_top=$(pwd)
+
+  %{__rmdir} $SB_BUILD_ROOT
+
+  cd ${build_dir}
+  %{__make} DESTDIR=$SB_BUILD_ROOT install
+  cd ${build_top}