Address HDF5 CVEs

Several CVEs have been published against the upstream HDF5 libraries, which are packaged (currently 1.8.13) with the windows version.

CVE-2016-4330
CVE-2016-4331
CVE-2016-4332
CVE-2016-4333

These have been fixed in the current 1.8.18 release.

Hat tip to @teeks99.

library_builders.sh

@@ -19,7 +19,7 @@ LIBWEBP_VERSION="${LIBWEBP_VERSION:-0.5.0}"
 XZ_VERSION="${XZ_VERSION:-5.2.2}"
 LIBYAML_VERSION="${LIBYAML_VERSION:-0.1.5}"
 SZIP_VERSION="${SZIP_VERSION:-2.1}"
-HDF5_VERSION="${HDF5_VERSION:-1.8.17}"
+HDF5_VERSION="${HDF5_VERSION:-1.8.18}"
 LIBAEC_VERSION="${LIBAEC_VERSION:-0.3.3}"
 LZO_VERSION=${LZO_VERSION:-2.09}
 BLOSC_VERSION=${BLOSC_VERSION:-1.10.2}