Fix Travis OSX build (libsndfile).

.travis/before_install.sh

@@ -10,5 +10,5 @@ elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
   sudo ln -s /usr/local /opt/local
   brew update
   brew upgrade cmake
-  brew install jack libsndfile
+  brew install jack
 fi

CMakeLists.txt

@@ -67,6 +67,10 @@ if (WIN32)
     set_target_properties(sndfile PROPERTIES LINKER_LANGUAGE CXX)
     file(COPY "${WIN_SNDFILE_PATH}/bin/libsndfile-1.dll" DESTINATION ${CMAKE_BINARY_DIR})
     target_include_directories(sndfile INTERFACE "${WIN_SNDFILE_PATH}/include")
+elseif (APPLE)
+    add_library(sndfile STATIC IMPORTED)
+    set_target_properties(sndfile PROPERTIES LINKER_LANGUAGE CXX)
+    target_include_directories(sndfile INTERFACE "usr/local/include")
 endif()
 
 add_subdirectory(sfizz)