hdf5: enable szip with libaec

szip is unfree, that's why using it was disabled by default. Also, if
cmake was called with `-DHDF5_ENABLE_SZIP_SUPPORT=ON`, we got the
messages:

    -- Could NOT find libaec (missing: libaec_DIR)
    CMake Warning at CMakeFilters.cmake:221 (message):
    SZIP support in HDF5 was enabled but not found

Meaning the library szip was no longer in use by this library since an
earlier release.

pkgs/development/interpreters/gnudatalanguage/default.nix

@@ -41,6 +41,7 @@
   # Unfree optional dependency for hdf4 and hdf5
   enableSzip ? false,
   szip,
+  libaec,
   enableHDF4 ? true,
   hdf4,
   hdf4-forced ? null,
@@ -84,7 +85,7 @@ let
           mpiSupport = enableMPI;
           inherit mpi;
           szipSupport = enableSzip;
-          inherit szip;
+          inherit libaec;
         }
         // lib.optionalAttrs enableMPI {
           cppSupport = false;

pkgs/tools/misc/hdf5/default.nix

@@ -10,8 +10,8 @@
   fortran,
   zlibSupport ? true,
   zlib,
-  szipSupport ? false,
-  szip,
+  szipSupport ? true,
+  libaec,
   mpiSupport ? false,
   mpi,
   enableShared ? !stdenv.hostPlatform.isStatic,
@@ -63,7 +63,7 @@ stdenv.mkDerivation rec {
       zlibSupport
       zlib
       szipSupport
-      szip
+      libaec
       mpiSupport
       mpi
       ;
@@ -82,7 +82,7 @@ stdenv.mkDerivation rec {
   ++ optional fortranSupport fortran;
 
   buildInputs =
-    optional fortranSupport fortran ++ optional szipSupport szip ++ optional javaSupport jdk;
+    optional fortranSupport fortran ++ optional szipSupport libaec ++ optional javaSupport jdk;
 
   propagatedBuildInputs = optional zlibSupport zlib ++ optional mpiSupport mpi;