Modified 'ARDUINO_SDK_PATH' entirely - Now resides directly under 'C:\'.

Author: MrPointer

appveyor.yml

@@ -4,14 +4,15 @@ environment:
   MINGW_PATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin
   matrix:
   - ARDUINO_SDK_VERSION: 1.8.2
-    ARDUINO_SDK_PATH: $pwd\arduino-sdk\arduino-1.8.2
+    ARDUINO_SDK_PATH: C:\arduino-sdk\arduino-1.8.2
   - ARDUINO_SDK_VERSION: 1.8.7
-    ARDUINO_SDK_PATH: $pwd\arduino-sdk\arduino-1.8.7
+    ARDUINO_SDK_PATH: C:\arduino-sdk\arduino-1.8.7
 cache:
 - '%ARDUINO_SDK_PATH%'
 install:
 - ps: cinst unzip
 - ps: $sdk_file = "arduino-$env:ARDUINO_SDK_VERSION-windows.zip"
+- ps: cd C:\
 - ps: |
     if ( -Not (Test-Path -Path $env:ARDUINO_SDK_PATH) )
     {
@@ -25,6 +26,7 @@ before_build:
 build_script:
 # Add the MinGW Path to the system PATH temporarily for this session
 - ps: $env:Path += ";$env:MINGW_PATH"
+- ps: cd $env:APPVEYOR_BUILD_FOLDER
 - ps: mkdir build
 - ps: cd build
 - ps: echo "$env:ARDUINO_SDK_PATH"