Fix MinGW sh.exe must not found and missing <chrono> header

appveyor.yml

@@ -64,8 +64,8 @@ install:
 - cmd: if [%COMPILER%]==[msvc] (mkdir build)
 - cmd: set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
 - cmd: set PATH=%MINGW_DIR_BIN%;%PATH%
-- cmd: if [%COMPILER%]==[mingw] (cd build-debug & cmake .. -G %GENERATOR% -DCMAKE_INSTALL_PREFIX="..\install" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_DEBUG_POSTFIX=_d -DBUILD_INSTALL=ON || exit 1 & cd ..)
-- cmd: if [%COMPILER%]==[mingw] (cd build-release & cmake .. -G %GENERATOR% -DCMAKE_INSTALL_PREFIX="..\install" -DCMAKE_BUILD_TYPE=MinSizeRel -DCMAKE_DEBUG_POSTFIX=_d -DBUILD_INSTALL=ON || exit 1 & cd ..)
+- cmd: if [%COMPILER%]==[mingw] (cd build-debug & cmake .. -G %GENERATOR% -DCMAKE_INSTALL_PREFIX="..\install" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_DEBUG_POSTFIX=_d -DBUILD_INSTALL=ON  -DCMAKE_SH="CMAKE_SH-NOTFOUND" || exit 1 & cd ..)
+- cmd: if [%COMPILER%]==[mingw] (cd build-release & cmake .. -G %GENERATOR% -DCMAKE_INSTALL_PREFIX="..\install" -DCMAKE_BUILD_TYPE=MinSizeRel -DCMAKE_DEBUG_POSTFIX=_d -DBUILD_INSTALL=ON  -DCMAKE_SH="CMAKE_SH-NOTFOUND" || exit 1 & cd ..)
 - cmd: if [%COMPILER%]==[msvc] (cd build & cmake .. -G %GENERATOR% -DCMAKE_INSTALL_PREFIX="..\install" -DCMAKE_DEBUG_POSTFIX=_d -DBUILD_INSTALL=ON || exit 1 & cd ..)
 
 build_script:

src/rew/encoder/physical_audio_sink.cpp

 #include <portaudio.h>
+#include <chrono>
 #include <rew/encoder/physical_audio_sink.h>
 
 class rew::AudioInitializer {