add inno setup path to appveyor

Author: mateoconlechuga

appveyor.yml

@@ -20,6 +20,8 @@ install:
   - if defined MINGW_ROOT if defined USING_MSYS2 set PATH=%MINGW_ROOT%\bin;C:\msys64\usr\bin\;%PATH%
   #- if defined MINGW_ARCH bash -lc "pacman --needed --noconfirm -S mingw-w64-%MINGW_ARCH%-boost mingw-w64-%MINGW_ARCH%-libarchive"
 
+  - set PATH="C:\Program Files (x86)\Inno Setup 5";%PATH%
+
 build_script:
   - if defined MINGW_ROOT mingw32-make -j%NUMBER_OF_PROCESSORS% install release release-libs