THRIFT-4081: appveyor retooling - added mingw64 build as a second job to the CI build process

This closes #1205
diff --git a/build/appveyor/MSVC-appveyor-build.bat b/build/appveyor/MSVC-appveyor-build.bat
new file mode 100644
index 0000000..ee022cb
--- /dev/null
+++ b/build/appveyor/MSVC-appveyor-build.bat
@@ -0,0 +1,44 @@
+::
+:: 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.
+::
+
+@ECHO OFF
+SETLOCAL EnableDelayedExpansion
+
+CD build\appveyor                           || EXIT /B
+CALL cl_banner_build.bat                    || EXIT /B
+CALL cl_setenv.bat                          || EXIT /B
+MKDIR "%BUILDDIR%"                          || EXIT /B
+CD "%BUILDDIR%"                             || EXIT /B
+
+@ECHO ON
+  cmake "%SRCDIR%" ^
+    -G"%GENERATOR%" ^
+    -DBOOST_ROOT="%BOOST_ROOT%" ^
+    -DBOOST_LIBRARYDIR="%BOOST_LIBRARYDIR%" ^
+    -DCMAKE_BUILD_TYPE="%CONFIGURATION%" ^
+    -DCMAKE_INSTALL_PREFIX="%INSTDIR%" ^
+    -DINTTYPES_ROOT="%WIN3P%\msinttypes" ^
+    -DLIBEVENT_ROOT="%WIN3P%\libevent-%LIBEVENT_VERSION%-stable" ^
+    -DOPENSSL_ROOT_DIR="%OPENSSL_ROOT%" ^
+    -DOPENSSL_USE_STATIC_LIBS=OFF ^
+    -DZLIB_LIBRARY="%WIN3P%\zlib-inst\lib\zlib%ZLIB_LIB_SUFFIX%.lib" ^
+    -DZLIB_ROOT="%WIN3P%\zlib-inst" ^
+    -DWITH_PYTHON=%WITH_PYTHON% ^
+    -DWITH_SHARED_LIB=OFF ^
+    -DWITH_STATIC_LIB=ON                    || EXIT /B
+@ECHO OFF
+
+cmake --build . ^
+  --config "%CONFIGURATION%" ^
+  --target INSTALL                          || EXIT /B