Fix missing compiler and some C++ errors

.travis.yml

@@ -60,12 +60,12 @@ install:
   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then
       curl -LO https://downloads.sourceforge.net/project/scons/scons-local/3.0.5/scons-local-3.0.5.zip;
       unzip scons-local-3.0.5.zip;
+      choco install visualstudio2017-workload-vctools -y
     fi
 
 script:
   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then
       export SCONS="./scons.bat";
-      /c/Program\ Files\ \(x86\)/Microsoft\ Visual\ Studio/2017/BuildTools/Common7/Tools/VsDevCmd.bat;
       ./build_libs.bat $TARGET;
     else
       export SCONS="scons";

SConstruct

@@ -81,6 +81,7 @@ else:
     cpp_library += '.release'
     env['target_path'] += 'release/'
 
+env.Append(CXXFLAGS = '-std=c++17')
 cpp_library += '.' + str(bits)
 
 # make sure our binding library properly includes