silo: bump revision when changing hdf5

[kurtjaeke@…]

The binary packages of silo need to be rebuilt when hdf5-18 changes, otherwise this error message appears and abort()s the program:

Warning! ***HDF5 library version mismatched error***
The HDF5 header files used to compile this application do not match
the version used by the HDF5 library to which this application is linked.
Data corruption or segmentation faults may occur if the application continues.
This can happen when an application was compiled by one version of HDF5 but
linked with a different version of static or shared HDF5 library.
You should recompile the application or check your shared library related
settings such as 'LD_LIBRARY_PATH'.
You can, at your own risk, disable this warning by setting the environment
variable 'HDF5_DISABLE_VERSION_CHECK' to a value of '1'.
Setting it to 2 or higher will suppress the warning messages totally.
Headers are 1.8.7, library is 1.8.8
	    SUMMARY OF THE HDF5 CONFIGURATION
	    =================================

General Information:
-------------------
		   HDF5 Version: 1.8.8
		  Configured on: Thu Nov 17 06:53:10 PST 2011
		  Configured by: macports@beta.macosforge.org
		 Configure mode: production
		    Host system: i386-apple-darwin10.8.0
	      Uname information: Darwin beta.macosforge.org 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386
		       Byte sex: little-endian
		      Libraries: 
	     Installation point: /opt/local

... and a lot of more text.

Please bump silo's revision. Thanks.

[mf2k (Frank Schima)]

r90246.