fix for build windows (#646)

Author: Thaina

cmake/unity_mono.cmake

@@ -275,6 +275,7 @@ macro(mono_add_internal name output_type)
   set(VAR_DEFINES "TRACE")
   set(VAR_OUTPUT_TYPE ${output_type})
 
+  string(APPEND VAR_REFERENCE "    <Reference Include=\"netstandard\" />\n")
   string(APPEND VAR_REFERENCE "    <Reference Include=\"System\" />\n")
   string(APPEND VAR_REFERENCE "    <Reference Include=\"System.Core\" />\n")
 

scripts/build_scripts/build_zips.py

@@ -771,6 +771,8 @@ def main(argv):
 
   if FLAGS.use_boringssl:
     cmake_setup_args.append("-DFIREBASE_USE_BORINGSSL=ON")
+  else:
+    cmake_setup_args.append("-DFIREBASE_USE_BORINGSSL=OFF")
 
   if is_ios_build():
     cmake_setup_args.extend(get_ios_args(source_path))