Add Appveyor script, fix 32bit Windows compilation

.appveyor.yml

@@ -0,0 +1,22 @@
+clone_depth: 1
+version: "{build}"
+image: Visual Studio 2015
+platform:
+  - x86
+  - x64
+environment:
+  matrix:
+    - compiler: msvc
+install:
+  - vcpkg install --triplet %PLATFORM%-windows fftw3 libsamplerate libsndfile sdl2
+build_script:
+  - cd %APPVEYOR_BUILD_FOLDER%
+  - mkdir build
+  - cd build
+  - ps: $env:CMAKE_PLATFORM="$(if ($env:PLATFORM -eq 'x64') { 'x64' } else { '' })"
+  - ps: $env:QT_SUFFIX="$(if ($env:PLATFORM -eq 'x64') { '_64' } else { '' })"
+  - cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_PREFIX_PATH=c:/Qt/5.9.5/msvc2015%QT_SUFFIX%;c:/tools/vcpkg/installed/%PLATFORM%-windows -DCMAKE_GENERATOR_PLATFORM="%CMAKE_PLATFORM%" ..
+  - cmake --build . -- /maxcpucount:4
+  - cmake --build . --target tests
+cache:
+  - c:/tools/vcpkg/installed

CMakeLists.txt

@@ -474,7 +474,7 @@ ELSE()
 ENDIF(WANT_DEBUG_FPE)
 
 # check for libsamplerate
-FIND_PACKAGE(Samplerate 0.1.8 REQUIRED)
+FIND_PACKAGE(Samplerate 0.1.8 MODULE REQUIRED)
 
 # set compiler flags
 IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")

include/AudioSdl.h

@@ -88,8 +88,8 @@ private:
 	surroundSampleFrame * m_outBuf;
 
 #ifdef LMMS_HAVE_SDL2
-	uint64_t m_currentBufferFramePos;
-	uint64_t m_currentBufferFramesCount;
+	size_t m_currentBufferFramePos;
+	size_t m_currentBufferFramesCount;
 #else
 	Uint8 * m_convertedBuf;
 	int m_convertedBufPos;