contrib: add native windows support for libsndfile

Change-Id: Ib78e459812dddc3d25dab7998f7ea5b9da07a758
Reviewed-by: Sebastien Blin <sebastien.blin@savoirfairelinux.com>

contrib/src/sndfile/fetch_and_patch.bat

+set BUILD=%SRC%..\build
+
+set SNDFILE_VERSION=1.0.25
+set SNDFILE_URL=http://www.mega-nerd.com/libsndfile/files/libsndfile-%SNDFILE_VERSION%.tar.gz
+
+mkdir %BUILD%
+
+if %USE_CACHE%==1 (
+    copy %CACHE_DIR%\libsndfile-%SNDFILE_URL%.tar.gz %cd%
+) else (
+    %WGET_CMD% %SNDFILE_URL%
+)
+
+7z -y x libsndfile-%SNDFILE_VERSION%.tar.gz && 7z -y x libsndfile-%SNDFILE_VERSION%.tar -o%BUILD%
+del libsndfile-%SNDFILE_VERSION%.tar && del libsndfile-%SNDFILE_VERSION%.tar.gz
+rename %BUILD%\libsndfile-%SNDFILE_VERSION% sndfile
+
+cd %BUILD%\sndfile
+
+%APPLY_CMD% %SRC%\sndfile\vs2017.patch
+
+cd %SRC%
\ No newline at end of file