Initial set of files.

The make install target is not working for .proto files, but otherwise
it seems to work.

cmake/SelectMSVCRuntime.cmake

@@ -0,0 +1,46 @@
+# ~~~
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+# When compiling against *-static vcpkg packages we need to use the static C++
+# runtime with MSVC. The default is to use the dynamic runtime, which does not
+# work in this case.  This seems to be the recommended way to change the
+# runtime:
+#
+# ~~~
+#  https://gitlab.kitware.com/cmake/community/wikis/FAQ#how-can-i-build-my-msvc-application-with-a-static-runtime
+# ~~~
+#
+# Note that currently we use VCPKG_TARGET_TRIPLET to determine if the static
+# runtime is needed. In the future we may need to use a more complex expression
+# to determine this, but this is a good start.
+#
+if (MSVC AND VCPKG_TARGET_TRIPLET MATCHES "-static$")
+    foreach (flag_var
+             CMAKE_CXX_FLAGS
+             CMAKE_CXX_FLAGS_DEBUG
+             CMAKE_CXX_FLAGS_RELEASE
+             CMAKE_CXX_FLAGS_MINSIZEREL
+             CMAKE_CXX_FLAGS_RELWITHDEBINFO)
+        if (${flag_var} MATCHES "/MD")
+            string(REGEX
+                   REPLACE "/MD"
+                           "/MT"
+                           ${flag_var}
+                           "${${flag_var}}")
+        endif ()
+    endforeach (flag_var)
+    unset(flag_var)
+endif ()