optionally use static libraries of libsndfile and its dependencies
Define the environment variable PYSNDFILE_USE_STATIC to use static libraries for libsndfile instead of shared libraries. This can avoid conflicts between versions and produce a self-contained wheel The environment variable PYSNDFILE_IGNORE_PKG_CONFIG can be defined to ignore pkg-config information in case of errors in the definitions (usually dependencies) or a buggy version of pkg-config